[Elwood]

Thanks Bill. I figured out a place to cross reference the Cardone number on the two ECM’s I have and called a couple of my favorite salvage yards only to hit another puzzle. My ECM’s are both part #77-6462, which crosses to a GM #1226462. According to my trusty salvage yard guy and his Hollander’s Interchange this number is correct for the 85’ Fleetwood, not the Eldo. The only used GM ECM I could find was a 1226028, which Hollander’s says is one of the two possible part numbers for my car. However, after your comment that the ECM translates distributor input to injector output I again have trouble connecting a fuel problem to loss of spark to two sequential cylinders, only when hot, and only in a narrow RPM band. Particularly since the spark plugs still look like they only have 1000 miles on them (which they do) and everything else has about 1000 miles on it too. Is there anything else common to the #4 & #8 cylinders that I haven’t thought of?