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P300 random multiple misfire

A

Andrew715

New member
I am having a problem with my 2001 gtp. I have replaced plugs and wires, coil packs, ignition control modual, and catylitic converter and my car still has very little power. it starts and idles fine but when I hit the gas it starts to miss very bad. The code is a 300 random multiple missfire. If anyone has any tips, please let me know.

AJ
 


Andrew...when I welcomed you earlier..i didn't see you posting this quick. Well..bummer that it's not running good.

Let's start off with teh basics. Year, model, any mods ?
 
I just had the same problem on a 99 gtp i just bought. what you have change are the most common problems.
but the other common problems are the lower intake gasket, supercharger gasket, throttle boby gasket. you can check thoughs with a can for carb or brake cleaner. with the car running spray around the base of the gaskets to see if the races or stumbles. it could also be the throttle positioning sensor, if you replace that it does need to be recalibrated. I am will to bet it is one of the gaskets though, I ended up changing all 3 on mine. hope that help.
 


Crizzo,
Thanks for your suggestions, I have already sprayed for leaks once, but I am going to do it again tomorrow and I will let you know what I find.
 
You from fridley MN?

And those bosch plugs are some of the worst for our motors. You can only run Iridium and copper core plugs in our motors.

So if you plan to keep it stock, get some iridium plugs.
 
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