How maney cylinders does a shift interrupt switch cut out. If the switch is bad could it limit the number of cylinders firing while on the muffs in the driveway. Thanks Scott
Since the switch grounds the ignition then, yes, it "could" keep the engine from firing. I don't think it's very likely though. An Ohm meter will tell you in just a few seconds, it's a very simple check to verify/eliminate the switch. Check it real quick and then move on to a reasoned trouble shooting approach to the problem.