Here are two things that are rare, but have gotten me before. One time I had a loose engine ground wire. During idle or regular driving, there were no problems. But when I stomped on it, the engine twisted and moved just enough that it disturbed the ground contact, and that caused a miss. Another time, quite recently, the positive wire on my coil was loose. At first, I only had a miss at full throttle, but eventually it got worse. At first, both times, I thought is was a fuel (carb) problem.
