I have a 86 240 wagon that runs fine about 70 % of the time, then it will bog on applying the pedal, and gag and sputter but still run just poorly and about 5 minutes later will run fine again, all new plugs, cap, rotor, wires, both fuel pumps, and air mass. I did have a accident where a "big" screw driver touched my positive battery lead grounded to my distribution box on my fender wall, and charred the box, which I replaced. Sounds like I charred somthing else, I just don't know what it is? Please help diagnose "Betsy Blue".