After running,the engine will not start. But if left for awhile it starts and it seems to be getting worse. It sometimes quits while idling and has to sit awhile before starting. have replaced---fuel pump,spark plugs and wires, rotor and distributor cap.

Please see my tip at http://www.fixya.com/cars/r7427423-fix_poor_idle_high_idle_stalling_fuel . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

check fuel pressure.when was fuel filter last changed? check all sensor connections.

Replace fuel filter to start and run a cleaner

Sounds like the warm start choke. It positions the carb butterflies when the car is warm and adjusts the fuel mixture.

I had an 88 that did something like that, it would idle up and down it seemed to be worse when the engine was cold. It turned out to be the MAP sensor, I never did get a check engine light. A friend of mine had the same truck and we swaped sensors back and forth until we found the problem.

check the idle control valve they sometimes get dirty

I have a 2003 tribute that was doing the same thing. It started right up but if you stopped at the store and came out it would start but not stay running. After waiting a couple hours it would start right up. We replaced the idle control valve and put in a new air filter because it was quite dirty and so far no problem. Give it a try.

hi, the valve springs are bad in this vehicle. this is causing the misfire. this is quite hard for the CPU to pick up. normally, the cam sensor will at times.

iac motor, is a problem this time of year

get a code reader like the Actron CP9015 Code Scanner, for 20 dollars and follow the directions. count the flashes and post the code if you need further help