On 2 Jun 2005 10:58:57 -0700, "Rob" > wrote:

>My 2000 Malibu V6 performs much better in warm to hot temperatures then
>on cool/cold days. Better acceleration and power and overall smoother
>sounding engine. There's about 92000 km on the car now. Anyone have any
>idea of what might give this?

Any codes set by the PCM?? Does the 'Check Engine' light come on??

Is this condition only when the car is still warming-up on cold days??

I'd start by checking the IAT & coolant temp sensors. If either have
gone flakey, your injectors will deliver an inappropriate amount of
fuel.

Regards, Al.