Right you are Bill, though I posted it straight from a text file. lesson learned. Thanks for the tip.
I have not bypassed the resistor yet. Will try that, then start looking (again) for a loose wire(s). This Classic Parts wiring harness has had more than its' share of connectors that were over-crimped.
Strange that it happens while sitting perfectly still sometimes and moving others.
Maybe I'll try wiggling the ignition switch again to get it to act up. But it will idle all day long (I think) with no trouble.
Has me stumped, that's for sure.
