Quote Originally Posted by robot View Post
Look at your rotor. At the center on the underside, look for a small, pin sized black spot where the spark is arcing thru to ground against the distributor shaft. Many times, a module gets changed when the problem is the rotor. Many garages charge for a module change and fix the problem with a new rotor. Again, dont buy the crap brands that the off brand parts houses sell (Checker, PBs, etc sell crap usually)

mike in tucson
excellent mention i hadn`t worked on anything gm for nearly a hunnert years and had forgotten how many burned rotors i`d replaced