ok,i have searched the site but found nothing. ok, when the car is cold it runs great. but once it heats up to normal operating temp and the computer starts reading on "closed loop"(i think that's right but either way it's once it heats up) i can't drive over 1500 rpms with out big problems. not positive that this is it but this is what it feels like: something is telling the computer to cut fuel then add it. then repeats. so a lot of bucking and jerking. only does this at full throttle though. at part throttle it only revs the motor from 1k to 1.5k rpms and won't hardly move (unless under 1500rpms). so basically the car isn't driveable. no check engine codes or anything. i swapped the ecu with a friend of mines' eprom ecu but the car still does the same thing. so the ecu isn't bad. all i can figure is that it must be a bad sensor somewhere. i need help on this fast. any help would be greatly appreciated.