Before you go crazy troubleshooting this, try to borrow (or buy, worst thing you have a good spare) a known good ECU. I also ran an external ground wire to one of the bolts on mine. This is an easy cheap thing to try.
Our plan is to replace the wires/cap rotor today as they are 40ish years old.
And then to "borrow" the ign module and coil off Denise's duster one at a time.
I'm trying to use this as a teachable moment about the diagnostic process for Dany and Nick.
And the module has had a ground wire since it was installed 2 or 3 years ago.
I am betting its a module or a coil but like I said, a teachable moment..
