I have a 1972 350 4 barrel with HEI, in a 1967 chevy C10 pickup which isn't driven much. Recently changed Spark Plugs and it runs fine except under load and then it cuts out but if you let off gas it runs smooth again. Checked under hood at night and there are no obvious arching between wires or to ground. Are the wires still the most like culprit. They haven't been changed in 20 years, Yea I know, but they never caused any problems. TIA
- posted
20 years ago