Question about 2000 Pontiac Grand Prix

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When my 2000 Pontiac Gran Prix accelerates to about 4000 rpm it acts like one cylinder is cutting out but runs fine up to that point. I have replaced the coil pack assembly and the ignition module plugs, wires, and fuel filter. Any ideas what else could cause this?

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  • Pontiac Master
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The fuel may be contaminated,use a bottle of lucas,and two bottles of heet in the fuel tank,this will take care of the moister in the tank,and clean the injectors,and fuel system.

Posted on Nov 16, 2009

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1 Answer

At 4000 rpm the motor cuts out shuts down but it runs smooth from800 to 3900 rpm and it has a rough idle.


Kind of sounds like low fuel pressure or bad ignition. Clean spark plugs, distributer, and fuel filter.

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Car accelerated to 4000 to 5000 rpm by itself.


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Car starts and idols fine but once you get it to 4000 rpm it cuts out and then every time you hit the gas it will accelerate then cut out. it doesn't die out until you do this for a long time.


Ya know First i never drive a car at 4ooo RPMS cant remember when but anyway.
Check the Intake Air tube the goes into the air cleaner and throttle body for cracks and cuts and being loose. Fuel Pressure have it checked while you are driving to make sure your noy loosing fuel pressure at the high Rs. Ignition System Factory Plugs and wires no fancy discount suppose to increase horsepower stuff

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