340 Chugging instead of Reving
If you think it’s ignition, you want to contact this guy and have him look at it for you. He is the guy who ran the R&D for Mallory for all the digital boxes. He’s retired now but he still does repairs for a decent price.
I don’t have any 685 boxes laying around or I’d send you one so you could test it.
[email protected]
Send Dave an email and he will hook you up.