Alright so I have a bone stock 2003 GP GT with 124k on the clock. Up until a week or two ago it has been a great car that I have owned since it had about 40k on it. So cutting to the chase the car had a flashing check engine light when I was getting on the highway. Had it checked and it pulled a P0301 code. Cylinder 1 misfire.
So I decided that the plugs in it were probably the same ones that rolled out from the factory(They were). Changed them to a set of NGK stock replacements and gaped them to .060. Put the plugs in and the problem went away.(Or so I thought.) A couple 2 or 3 days later the light came on and threw the same code again. I did notice that it only comes on when I seem to be putting the pedal down and the tach is reading 5K or more. Possible bad coil causing this? I plan on getting plug wires for it tonight and checking to see where that lands me since it is the cheapest option.
I was just reading around on here and noticed people talking about a possible problem being an (ICM) ignition control module. How common is it that these things go bad? I am no dummy when using a DMM so if there is a way I could test it before throwing parts at the car in hopes of fixing things, any direction on how to test the module would be great.
Thanks in advance.
