OK, made some progress tonight. I took a meter and measured .10 to .20 volts between the engine and the body. I took jumper cables and jumped from the strap on the engine to the master cylinder. The misfiring stopped. I let it run for 10 minutes. It was normal. I removed the jumper, it ran for 6 minutes fine then started misfiring. I put the strap back in place, it ran normal again. It looks like I have a ground problem, broken wire as you suggested. I will run through it again tomorrow to reconfirm.
I'll keep this thread updated as I find things out. Thanks for your advice.
Last edited by GaryC : 10-05-2017 at 07:44 PM.
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