Hi all. My car has a very bad misfire. The car is barely driveable. my codes are p0300, p0302, p0303, p0304

The car has a K04, but I'm running a GIAC tune for the k03. Does anyone know if this could be causing my misfire?

I've replaced the plugs gapped at .028, moved coilpacks around, replaced vacuum lines, adjusted fuel pressure, and cleaned the MAF with MAF sensor cleaner. The coilpacks are hitachi's, so I don't think it's them. I need to get this car running! I bought it for 5750 and I'm starting to think is was a very bad choice. I'm starting to question my decision making abilities in general. Someone help me save my car and my pride.

Thanks!

 

Contact GIAC. They should be able to answer the question.