I'm sorry guys. You are correct in your guessing though. C1, it is exactly like you said, a miss like a cough or sputter; but isolated to the engine area. Dudesky, it happens on a cold engine and from acceleration from a traffic light or stop sign. I'll have to notice the RPM if it happens again. There is no "check engine" light or anything diagnostic showing in the dash. I thought it might be the engine mount, fuel filter or poor quality gas/low octane?