Crappy idle, misfire on one cylinder.

[69L78]

Originally Posted by Woj

It seems like the coil is the only thing you have left to change. Maybe swap out the coil for a known good coil? One thing I have found in the past is that most point sets, even the later GM are junk. I was told to give Echlin points a try, I did and really do like the quality of their points. I bought these at NAPA.

Good luck and let us know what you find.

I have never had a problem with points my whole life. I also buy from NAPA and use the heavy duty or high perf points with the heavier spring so you do not get the points bounce at higher pm. These are Blue Streak DR2270XP - points & DR70X - condenser. The Echlin distributor cap with the copper contacts is RR165.