[davepl]

Random trick: Also worth looking at the engine running underhood in a pitch-black garage (safely, please, don't gas yourself or stick your hand in the fan, etc).

Arcing shows up pretty easily if you look closely. I found one wire-to-ground arc that I could not see any reason for (not even a visible crack in the wire) but relocating it fixed the miss.

Make sure the coil's not hooked up backwards. I've never done it, but heard they will still run but run poorly.