Power loss when warm

[list@cemetery.homeunix.org (Andrew Basterfield)]

On Thu, 6 Mar 2003 06:39:07 -0500
"John Lagnese" <jlagnese@massed.net> wrote:

> Hi,
> Back again with the 195K mile 91 Jetta 1.8  8V gas. The head gasket
> and timing belt are changed. It runs like a champ until it gets warm,
> then it really stumbles around 4K. I can hardly get it to go above 4K.
> The compression is good - 125 - 135 on all cylinders. I'm very sure
> that the timing belt is correct, and if the timing is off wouldn't it
> be bad when the car is cold also?
> Any ideas?
> Thanks,
> John.

It's almost certainly fuel, maybe you are stuck in cold-start/warmup
mode and it is running way rich when warm? Rich mixture won't burn fast
so less power at high revs.

Check the coolant temp sensor.

--Andrew