- Jul 19, 2012
- 7
Had a P0304 and a thermostat code for awhile now but never a flashing CEL. Finally got around to new spark plugs and a new thermostat which seemed to have fixed all of my codes until tonight (about 1 week). During my original diagnosis I swapped around the coils to eliminate them and learned that over 1500 rpms the misfire goes away and it only misfires below 1500 rpms after the engine has warmed up. Its also on its second bottle of lucas fuel injector cleaner and a tank of premium. Any help would be greatly appreciated. Thanks!