[brett3533]

Greg be sure to check battery and alt you may have a bad cell or shorted battery. Be sure the alt is not stuck on full charge causing power loss have seen regulaters stick, also have you noticed battery needs charged more often. Have you done any welding on car which could have caused diodes in alt to go bad. When you changed jets did plugs get darker or stay white. also check all ground wires ect may have a wire that vibrated loose after put engine in and at track few times. Have you changed fuel system, I have seen a few, fuel cells mounted real high in trunk and lets fuel siphon thru carb while sets in garage and causes rings to loose seal. sorry to keep rambling on but could be anyhting. All posts on here are possibilities.