i suspect the idle valve, however i also suspect the air flow sensor, it does not rest at the proper height, most of them have that little bit of "bounce" but mine does not. also when i'm on the highway, if i stomp the pedal to the floor, it hesitates, and runs like crap, i let up on the pedal and it accelerates with more powe. this is really confusing me, i have to rework everything i know about pushing a gas pedal to get any kind of acceleration it seems, since when does a car accelerate better when you don't push the pedal all they way down? what parts have gone sour?