Quote Originally Posted by dpzelenak View Post
its not the cat, it has to be something to do with just cylinder 1, like a plug wire being routed the wrong way or a cracked head gasket on the outside of cyl 1, it could be alot of different things..im gonna say that you have a weak coil(ign coil), just because you said it only happends at high rpms and if the coil is weak then it cant fire enough voltage to over the high rpms..to test it i would take the coil for cyl 1, and swap it with a differnt coil, like taking the coil from the outside and moving it to the middle, if it is the coil then it should stop missing on cyl 1 and it should start to miss on whatever cyl you moved it to, and set another p030_ code for that cyl..
Bingo! I don't think it is anything major like a head gasket. I am crossing my fingers that its a bad coil. Under high RPM the coils obviously draw more current so I can easily see that being the problem. If I swap the coils around and the computer still throws that P0301 then I suppose its back to the drawing board. When you guys replace coils do you usually go with an aftermarket coil like the MSD, Accell's or with a factory replacement. I was shocked to see that it was only $150 for the MSD's. The last time I looked at the price of MSD coils was when I was in the market for my trans am and those suckers were $600 or more!