Gees I screwed up again by discribing the sound as popping, it was clicking. I have taken the ecm boxes apart to compare them. No smell. No signs of a meltdown.

I got one code, 42. We had just set the timing. That code has to do with what we were doing. It does blink 12 so that part has to be ok.

Let me back up a little here, I was in a rush this morning. The engine lugs down whenever I turn on accessories like blower, headlights and lighter. I'm sure you are thinking what I am. Probably the alternator. I did a test on it when this first happened. I had 12.98v at the battery. About 11.95v at the alternator when in idle with nothing else running. It dropped about .25v each time I turned on an accessory. I thought as long as the battery was good the engine should run ok until the battery go's. Am I wrong here? I understand that alternator should be putting out around 14v. I am on my way to retest and will let you know what I am getting now.

This happened on the test drive after I installed the new distributor. Ran fine at first, However I had not used a timing light yet. I didn't have the distributor tightened real tight yet. I just went by my marks. I thought it had turned a little when this happened. When I got it home after stopping a few times to readjust it. I put it on the timing light. It was at +20. I have it set to the spec at +10 now.
Thanks Stan

I just tested the alternator. It turned out 14.48 and under load it was 14.38. That should be fine, I think. Maybe the coil next if you think. Tomarrow I well start going through all the emission stuff. What's the most likely. I can look back on what you already sent to me. I well start there. I have to say the truck idles much better with the new ecm, doesn't drive any better though. You are a great help, it is appreicated.