since i bought my car its had the hesitation prob....but it just started to backfire, only when im punching it and shift to the next gear.....now for the hesitation at WOT from idle to about 4k rpm it does fine but between 4k and 5k it just hesitates like it doesnt want to pick up anymore the needle moves up and down...and the hesitation also occurs when im at normal speeds cruising but its just like a sputter and not as bad as at WOT any suggestions?........i replaced plugs, wires, cap, fuel filter.....i did mess with the distributor...it was too advance and the car was pinging....i also replaced the sensor pressed onto the distibutor i gues the PIP???..the car would turn off at any given moment , and i would have to let it sit for about 15 min before it would start up again....help!!!