|
Bad ground maybe between the battery and the Chassis. Did you sand it down to sheet metal.
Pick up a voltmeter. Test the chassis for ground continuity between the grounding terminal of the battery, random body panels, and the motor ground wire, and chassis. Intake mani and chassis, and finally make a LONG lead and test for continuity between the grounding strap/intake mani and the ground of the battery.
You symptoms sound like the plugs are not getting adequate voltage, causing spark break up.
|