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Q: when i start my car it idles ok until i touch the gas pedal. on 1990 Chevrolet Lumina

once i try and give it some throttle it bogs and dies out. as long as i dont touch the gas pedal it will stay idling for a long time but then eventually dies and when i try to go and start it again sometimes it just keeps cranking and wont start at all. what could be the problem? do u think maybe the fuel pressure regulator is bad.
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if its the original pump its just wearing out and can't build the pressure required to run car under load
i already replaced the fuel pump and filter when i first started having this problem. with a pressure guage attached to the test port i get about 40 psi when i turn the key to the on position but when the car is idiling its at about 20 - 22. thats not enough pressure is it? Also if i push the valve to release the pressure barely any fuel comes out.
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I BET YOU BOUGHT AN AFTERMARKET FUEL PUMP. THAT MIGHT BE THE PROB.NOT ENOUGH FUEL PRESSURE OR RESTRICTION IN LINE WHICH I DOUGHT
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Hard to answer until you have the computer scaned for codes and some basic visual checks and other test
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