What about a blocked gas tank vent? That will sure give your symptoms.

I don't know where it is on your vehicle, but if the air filter on the
bottom of my charcoal canister gets plugged with mud it puts a vacuum on
the gas tank and does a nasty immitation of running out of gas. Let it
sit for 10 minutes or so and away it goes again.

The fast test for this is to open the gas cap when it dies and see if it
starts right back up.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"rick.skowyra@ryersontull.com" wrote:
>
> Well, still no resolution to the problem. I replaced the fuel pump,
> crank sensor, cam sensor, and even the ECM! It still starts when
> cold, but then after running for about 20min starts to sputter, and
> dies. Then, you can't get it started again until it cools down. I was
> told to possibly check the MAP sensor ??

 

Coil.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

"rick.skowyra@ryersontull.com" wrote:
>
> Well, still no resolution to the problem. I replaced the fuel pump,
> crank sensor, cam sensor, and even the ECM! It still starts when
> cold, but then after running for about 20min starts to sputter, and
> dies. Then, you can't get it started again until it cools down. I was
> told to possibly check the MAP sensor ??

 

Coil.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

"rick.skowyra@ryersontull.com" wrote:
>
> Well, still no resolution to the problem. I replaced the fuel pump,
> crank sensor, cam sensor, and even the ECM! It still starts when
> cold, but then after running for about 20min starts to sputter, and
> dies. Then, you can't get it started again until it cools down. I was
> told to possibly check the MAP sensor ??

 

Coil.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

"rick.skowyra@ryersontull.com" wrote:
>
> Well, still no resolution to the problem. I replaced the fuel pump,
> crank sensor, cam sensor, and even the ECM! It still starts when
> cold, but then after running for about 20min starts to sputter, and
> dies. Then, you can't get it started again until it cools down. I was
> told to possibly check the MAP sensor ??

 

Coil.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

"rick.skowyra@ryersontull.com" wrote:
>
> Well, still no resolution to the problem. I replaced the fuel pump,
> crank sensor, cam sensor, and even the ECM! It still starts when
> cold, but then after running for about 20min starts to sputter, and
> dies. Then, you can't get it started again until it cools down. I was
> told to possibly check the MAP sensor ??

 

If it is, he can get some freeze spray from any electronics shop. When
it dies, give the coil a freeze spray shot and if it fires right back up
it is figured.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"L.W.(ßill) ------ III" wrote:
>
> Coil.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> "rick.skowyra@ryersontull.com" wrote:
> >
> > Well, still no resolution to the problem. I replaced the fuel pump,
> > crank sensor, cam sensor, and even the ECM! It still starts when
> > cold, but then after running for about 20min starts to sputter, and
> > dies. Then, you can't get it started again until it cools down. I was
> > told to possibly check the MAP sensor ??

 

If it is, he can get some freeze spray from any electronics shop. When
it dies, give the coil a freeze spray shot and if it fires right back up
it is figured.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"L.W.(ßill) ------ III" wrote:
>
> Coil.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> "rick.skowyra@ryersontull.com" wrote:
> >
> > Well, still no resolution to the problem. I replaced the fuel pump,
> > crank sensor, cam sensor, and even the ECM! It still starts when
> > cold, but then after running for about 20min starts to sputter, and
> > dies. Then, you can't get it started again until it cools down. I was
> > told to possibly check the MAP sensor ??

 

If it is, he can get some freeze spray from any electronics shop. When
it dies, give the coil a freeze spray shot and if it fires right back up
it is figured.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"L.W.(ßill) ------ III" wrote:
>
> Coil.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> "rick.skowyra@ryersontull.com" wrote:
> >
> > Well, still no resolution to the problem. I replaced the fuel pump,
> > crank sensor, cam sensor, and even the ECM! It still starts when
> > cold, but then after running for about 20min starts to sputter, and
> > dies. Then, you can't get it started again until it cools down. I was
> > told to possibly check the MAP sensor ??

 

If it is, he can get some freeze spray from any electronics shop. When
it dies, give the coil a freeze spray shot and if it fires right back up
it is figured.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"L.W.(ßill) ------ III" wrote:
>
> Coil.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> "rick.skowyra@ryersontull.com" wrote:
> >
> > Well, still no resolution to the problem. I replaced the fuel pump,
> > crank sensor, cam sensor, and even the ECM! It still starts when
> > cold, but then after running for about 20min starts to sputter, and
> > dies. Then, you can't get it started again until it cools down. I was
> > told to possibly check the MAP sensor ??

 

I actually tried the coil thing. Instead of freeze spray, we took it
out, put it in a bucket of ice water for a while. Put it back in and
still no start up.