Hi my name is Tom i have a 2003 evo witha 300 code i replaced spack plugs, wires, boots, coil packs, and serp belt because i think it was slipping. It putts at idle 950. I have catback and intake. can anyone please help with the p0300 multiple/random missfire?

 

Did it just start to happen randomly? After you changed a part? Full mod list? Any logs? any other information that may be able to help us.

 

Search disable p0300 test. The thread outlines how to disable it. It's a very common problem with an easy fix. GL