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

 

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CarChick74, 3.1L V6, New Boston, TX, June 26, 2013, 11:33
 Rookie

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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