coil pack wiring harness? Had p0301 and a p0351 code, it was already a new coil (borg warner) so i replaced it under warranty and same code so i bought and ac delco coil and my misfire went away but today i got a p0300 code i cleared it, it came back on for about 30 minutes then went off.

 

 

P0300 is a random misfire, which the PCM can mistake for another problem, rough idle. When was the last time you cleaned your MAF and Throttle Body?

 

Cleaned it a month ago. I do have a rough idle has new ac delco plugs, new intake gaskets, vvt solenoid, pvc hose.