recently purchased a 1997 jeep wrangler w/ 4cyl. 5 speed, no a/c. when the jeep warm up to operating temp. it idles @ 1500rpm. I've replaced the AIC control, the TPS, recent tune up. spayed around the intake and checked all lines for vacuum leaks and still having same problem. can anyone help ?

 

Maybe your throttle return spring is worn or broken.
Have you tried to see if you can pull any codes?

 

throttle spring is fine. it's seems that as the temp goes up so does the idle. if i shut it off for a few minutes the idle is reduced, then i drive it again and the idle raises to about 15 or 1600rpm's. i put it on a actron scanner and there are no codes to read.

 

Sticky throttle cable?
Dirty throttle body?
With a Manifold Pressure sensor (MAP) the PCM can interpret a vacuum leak as throttle input and won't necessarily kick out a code. You may want to re-check for a vacuum leak.

 

hey thanks for all the help. the intake manifold rear bolt that is by the firewall was loose. problem solved.

 

I should check my intake manifold bolts as well. Maybe that would fix my whistling engine.

 

it funny but they seem to just come loose. i suggest everyone check the that all bolts are tight.