Kohler ECV870 misfiring

[ILENGINE]

It sounds like a condenser issue on an old points type ignition system. I don’t see it in your diagram but does the ignition system have an ignition capacitor? I replaced mine two times before I got one that didn’t fail after a few minutes.

Engine is EFI so the fuel pump, ignition modules, fuel injectors , timing is all controlled by an ECM.