Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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it sounds like your fuel pump is loosing prime. by turning the key on and off, the pump will run for 2 seconds. once it reaches 40 lbs or better it will start and stay running until you shut it off.
this can be confirmed with a fuel pressure test. you can rent a tester at a parts store and check it yourself to confirm.