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Originally Posted by luke1834
Could this be a faulty Throttle position sensor? I would think a CEL would show if that was the case, but I have spoken to several mechanic friends and they have all mentioned the TPS.
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In cars that use a MAF to meter fuel (or a MAP for that matter), the TPS is used to adjust mixture for transient conditions (like almost no throttle to quickly full throttle) and to tell the ECU when the throttle is closed. I'm not sure that in a fairly steady state operation, like cruising, that the TPS has any influence. It could still be the problem, but I doubt it.
The TPS is very easy to check, it's just a potentiometer, all you need to do is know what the resistance should be at certain throttle positions and you can connect a multimeter to it to see if it's reading correctly.