P0306, but only appears every few months.

mikemaj82 said:

Every few months I seem to get a P0306 cylinder misfire code while driving. When I get home, I'll reset the code with my XTool D7, and it won't come back for a while. It seems to be in 2-3 month intervals. I don't feel any vibrating or hear anything different when the code is active, and the idle is normal. Just wondering why this would happen randomly. If it were a true misfire, the code should come right back after the reset and starting the engine again. If it happens again, I'm going to swap the coil with the one next to it, and see what happens. The car only has around 49K miles, and the spark plugs were changed about 2 years ago, and I put in Accel coils about 3 years ago. The only other thing I could think of is a possible issue with the injector or the wiring harness in that area being pinched.

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