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Why has my car stopped starting unless I press on the gas. on 2003 Pontiac Grand Prix

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It tries to start, but will not continue to run. I've replaced the fuel filter, spark plugs, and checked for vacuum leaks. In October, I replaced the throttle position sensor, idle speed control, thermostat, water pump and computer. This has happened off and on for a couple months now, but I am not getting any codes. I was told it could be the camshaft sensor. Please help!!! Thank you in advanced!!
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