Originally Posted by Lude Acts

That's not totally correct. I'm almost positive that for a random misfire code it is the kind of code that is only thrown after 2 runs of the vehicle that have a misfire. ( the engine has to completly warm up, misfire, be shut off, turned back on, warm up again, and misfire again for the code to come back) That's for a random misfire, which could be 1 out of every million revolutions is a miss. For an active misfire, the kind with a blinking CEL, and also the kind of miss that you will definately feel, what your buddy said is true. But for a random misfire, which most of the time you won't even feel, it has to be sensed on 2 runs of the vehicle for the code to be thrown.