Question about 1999 Pontiac Grand Prix

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Looses Power at high RPM's

I have a very similar problem. It started with engine code telling me that I have a cyclinger 1 misfire. I cleared it but it would come on when my RPM's would hit 4000. I changed the spark plugs, wires, fuel filter, air filter but I still have the orginal problem that the car looses power at 3- 4000 rpm. I can drive it 120 miles and hour at 2500 RPM and the power is there but as soon as I s stomp on it, it makes a weird noise and does not accelerate. There are no codes on the scan.
Thanks for your help -

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Hello! A cylinder misfire can be something as trivial as needing new spark plug wires, to having a dangerous lean condition in the fuel mixture. Assuming that you have a stock, un-modified car, with a stock, un-modified PCM, my suggestion would be to swap the coil packs, to isolate whether or not the 1 - 4 coil pack is faulty.


Hope this helps, and thanks for using FixYa!

Posted on Oct 02, 2009

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