At Wit's End With '91
#62
Did you ever order the factory service manual? If so, I'd check back to the ASD relay and see if there's a problem between them (since it's usually fed off the ASD).
Also, do be aware you won't see 12V there but for about 2 seconds on key-on until it starts running.
Have you tried bypassing the ASD to see if you then have 12V at the coil?
RwP
#63
#64
#65
Finally got to the bottom of it, although i did end up leaving it with a mechanic shop. It ends up being the ecm after all! Apparently, the one i picked up at o'reillys was no good. Don't know where the repair shop got theirs but it has the truck running as good as new. Thanks for all y'all hangin with me!
#66