HAD THE Distributor AND ROTOR REPLACED ON MY 1996 GMC, 4.3 V-6 ENGINE, TRUCK 3 MONTHS LATER TRUCK STARTED MISSING AGAIN, PULLED THE DISTRIBUTOR CAP AND FOUND THE ROTOR MELTED ON THE TOP, REPLACED THE ROTOR IT LASTED 3 DAYS AND SAME PROBLEM METAL TAB ON ROTOR WAS BURNT UP.
WHAT COULD BE CAUSING THIS?
The rotor is somehow making direct contact with one or more distributor contacts.
Check the contacts inthe cap to see if you find any physical damage to one or more contacts caused by the rotor.
Could be rotor lead too long (file it down) or maybe the distributor shaft is bent or not seated. Remove cap and observe the distributor shaft as someone cranks the engine. Does it wobble? Can't tell? Place a stiff reference parallel to the shaft and turn engine again.
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