Thanks a bunch for the reply. My thoughts are similar to yours. I believe the MAP sensor is built into the ECM on the LRG423 as I couldn't find one but there is what looks to be some sort of vacuum line going into the ECM. I will give that another look though. I've heard that the ECM is no longer made either. The crappy part about testing for the electrical issue popping the breaker is that we couldn't get her running again. But once we do, I'll follow your advice and see what we can find. I appreciate the referral to Pitt and will keep you posted!