what will make my car not start? it will crank over. but no fire. 2002 pontiac grand am?

doty

New member
i have changed fuel pressure regulator valve, throttle switch, gas cap, coolant temp sensor, and have put 3 used fuel pumps on. also changed the relay switch. i can put gas in the throttle body and it will start. runs great after that all day. but if i drive it to work and let it set until i get off, it won't start again. does any one have any idea what else could be the problem?
 
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