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One way to confirm if it's a spark problem or fuel delivery problem is, when it quits and won't start, remove air intake hose at throttle body opening and spray some WD-40 ( 2-3 sec. ) into throttle body, then try to start. If it fires up momentarily then stalls again, have fuel pressure tested. The WD-40 acts like quick start and if that fires the engine over, then you have spark, but not enough or any fuel. If that doesn't help, no start at all even with WD-40 sprayed in throttle body, then I'd think real serious about changing the hall effect pick-up ( pick-up coil) in distributor, if you have that style distributor. It is located under distributor cap below rotor, it looks like a round black plate in shape with wiring and connector at end of it. Remove cap, remove rotor, and lift it out, unplug from connector. Replace it in same position, then re-install rotor, then cap. They were a pretty common problem in earlier years. Engine would just quit anytime after it was warmed up, then sit for 15-20 minutes, then restart and go for a while and do it again.
I could be that the sensor could be dirty. They sell a spray at your local auto parts store specificly for the throttle body. It's should be connected to your air filter housing. Just try to clean the sensors and use the spray for the throttle body and that should help. Good Luck... It work for me...
Try cleaning the throttle body, Remove the intake hose that connects to the intake and air filter box. You will need a can of throttle body cleaner $6. and clean rag. Spray the cleaner in the throttle body and you will see black carbon build up running out of the throttle body. clean the butterfly, which is what opens/closes when the throttle is open or closed inside the throttle body. repeat 2-3 times and wipe it dry and clean with the cloth, be sure not to leave any material inside the throttle body. re-connect what you removed. It will be hard to start for a second, don't worry it's the cleaner. After start up let it run for a minute and test drive. Cheap fix on alot of vehicles.
cold start sensor is faulty. basically when you start a car from cold,the sensor mixes the air and fuel to allow more fuel to air ratio to start the car. as the engine warms the air fuel mixture weakens to give a economical fuel consumption.hence your car starts warm.
clean the IAC. Use spray carb cleaner and spray the idle air control valve. It is on the throttle body near the throttle plate. It may have become stuck with deposits.
Clean the throttle body as well. Check for vacuum leaks
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