Will Honea proclaimed:

> On Wed, 8 Sep 2004 03:33:54 UTC L.W.(ßill) ------ III
> <----------@***.net> wrote:
>
>
>>Hi Will,
>> Back when I was serious drag racer in the sixties we bought engines
>>cast for Colorado to gain a compression ratio running stock classes.
>>This Cherokee build order eludes to the difference still in cars:
>>"Emissions - High Altitude Tracking".
>>
>
>
> I thought that on those the "High Altitude Tracking" was mostly the
> aneroid that adjusted the metering rod positions. I guess now (with
> computer control and FI) that the MAF or MAP sensors wind up doing
> most of the adjusting thru the computer.
>
Dunno of any vehicle these days that comes with optional "Denver
Heads"

The OP has something wrong though. I get a power loss at high
altitude such as crossing the Colorado rockies, Sonora Pass, etc
but have never had the stalling, coughing, bucking etc.

 

Will Honea proclaimed:

> On Wed, 8 Sep 2004 03:33:54 UTC L.W.(ßill) ------ III
> <----------@***.net> wrote:
>
>
>>Hi Will,
>> Back when I was serious drag racer in the sixties we bought engines
>>cast for Colorado to gain a compression ratio running stock classes.
>>This Cherokee build order eludes to the difference still in cars:
>>"Emissions - High Altitude Tracking".
>>
>
>
> I thought that on those the "High Altitude Tracking" was mostly the
> aneroid that adjusted the metering rod positions. I guess now (with
> computer control and FI) that the MAF or MAP sensors wind up doing
> most of the adjusting thru the computer.
>
Dunno of any vehicle these days that comes with optional "Denver
Heads"

The OP has something wrong though. I get a power loss at high
altitude such as crossing the Colorado rockies, Sonora Pass, etc
but have never had the stalling, coughing, bucking etc.