We replaced the fuel filter, plugs, wires, distributer cap and rotor. The car definitely ran better after that, but began hesitating occasionally, sometimes stalling or nearly stalling at idle. It ran good at high speeds, seemed to have lots of power. Going on some advise from other posts, we sprayed the throttle body thoroughly with carb cleaner (about 1 full can), and it seemed to help with the hesitation on acceleration and rough idle. My son felt confident enough to drive the car home, and said that he was going to try another can of carb cleaner and see if the problem clears up. Thats all for now. I would appreciate any further advise, and thanks for the feedback.