how to accurately test ECM?

[tamperedchevy]

do you have catatlytic converters?

[Tyree]

no converter

[Tyree]

I somehow, someway came up with the hypothesis that my coil or some component within the ignition system was not performing under load. This was my best guess at this point because I was confident in the mechanics of the engine and the fuel system/wiring harness was working properly. This was really tricky because the symptoms would not reveal themselves consistently. I pulled the ignition module off the distributor and the pins connecting to the pickup coil were rusted and had green corrosion. I also decided to replace the coil as well. Took it for a test drive and it ran great. No issues. I cannot say specifically which component was failing. I ran the truck through city blocks and also on interstate without a single hiccup. I hope that this has resolved my phantom issue. I will know more after a few more test drives. Again, thank you to all of the contributors and suggestions on this post.

[MQQN28]

Tyree
Great you worked it out. Theres nothing better to nut out a fault like that to success.
Never give up

MOC