[Pvt Parts]

Two issues that I ran into with similar results. Super Stock Corvette.... fresh motor with engine miss. Looking at it at the track and thinking about pulling it out. I looked down and pulled on the main starter wire, the big one on the solenoid with the battery cable attached to it. It was loose, real loose like someone forgot to tighten it on install. Tightened the nut and the problem was fixed.

New Jerry Haas Comp car. Fouling plugs and killing coils in 4 to 5 runs. Chased the problem for half of the season. Finally drilled two holes in the frame tubes and ran a #10 wire from the frame tubes to each head under the header bolt. Problem fixed.

Maybe this will help. Good luck.