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check your spark by pulling a plug wire, put a screw driver in the boot and lat it close to an engine ground (try alternator bracket or block) if it shows any oranger replace engine control module on side of distributor. Use a 1/4 deep well socket to unscrew, unplug it and pull down. install in reverse order $34 at auto zone and they can check your old one too before you by a new one try you idle air control that could also be bad. next time it runs take it to auto zone for a free code check, even if there is no check engine light on there will be a storerd trouble code

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Q: Why does your 1991 f150 start some times and then won't start the nest day replaced air intake valve fuel relay fuel filter when key is in acess both pumps rundual tanks gets good fire help?
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