OK now, my no start is solved thanks to the Forum telling me where to focus! Woo Hoo!

I went back to check the Pickup coil and found the red connector to the ignition module loose (which I installed in some haste when I swapped back to the original 1988 ignition module)

So I guess I’m somewhat confident that this no start problem was the new/faulty ignition module I installed 6 months ago??

Buoyed with this success to get back drivable I plugged in the ALDL cable while the engine was idling ....and it immediately sped up 50 rpm.

Why does plugging in an open ended data cable shut down the truck one time and then increase the idle the next time??

I do see 4 rows of data in WinALDL, but it seems like I should be using Tunerpro??

Thanks for all the help so far,
Bob W