1995 cavalier 2.2. Did all tune up stuff... Still misses....Checked for vacuum leaks, nothing...Just for the heck of it i put a timing light on it and i think i remember reading that it fires twice per cycle(light goes real fast, even at idle). but cant find that now of course.

But anyways when it misses the timing light skips a beat to on all 4 cylinders....Could it be 2 bad coils?????? Or something else? I notice when driving it, and it does it, my tach drops briefly. And also should idle be 950??? I was looking and most say 800-850? Could be a symptom..