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How long since a tune-up? Check for applicable trouble codes? Make sure battery has a full charge and battery connections all good.
If it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure, also check fuel injector pulse. What about your security system?
repairpal.com > Problems > Pontiac > Grand Prix Engine Stall Or No Start Condition on Pontiac Grand Prix. The fuel ... 2006 Pontiac Grand Prix- 3.1L V6102,000Visitor ... 2002 Pontiac Grand Prix- 3.8L V698,000Visitor.My ... V6 3.8L 2DR Coupe My car suddenly began having problems.
indicates problem injectors
a cheap test is to run a couple of cans quality injector cleaner through the fuel tank and if that doesn't improve it have the injectors cleaned and checked
while that is happening run the fault codes to check for other problems
2010 3.5l v6
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