You might try swapping just the solenoids on the bad injectors from one good one to one bad, see if the problem "moves". IIRC, you can also briefly run the truck with the valve cover off, and see if each injector is spitting out the HP oil it uses on each injection.
Thank you very much!!! You probably saved me a lot of time and about $1200!
1 & 3 were not squirting oil, but 5 & 7 were. I found a GB Tech bulletin (TB# 103) with the pinout for the IDM and specs for testing the injector resistance and wiring. Said they should be between 2.8 & 3.6 ohms:
pins 24&6, cyl 1, 0.6 ohms
pins 24&21, cyl. 3, 1.1 ohms
pins 24&8, cyl 5, 3.0 ohms
pins 24&20, cyl 7, 3.0 ohms
pins 23&22, cyl 2, 3.0 ohms
pins 23&7, cyl 4, 3.0 ohms
pins 23&19, cyl 6, 1.1 ohms
pins 23&9, cyl 8, 3.0 ohms
So instead of 2 injectors not working, there were 3... I called my local injection shop, then went there and picked up 3 used AA injector coils for $20 each, $60 total. They sell new ones for $50 each.
Came home and put on 1&3... (screws are torqued at 18 inch pounds) They are back up and squirting oil fine. Now if I pull the pull on those 2 injectors, I can hear a miss That didn't affect those before the change.
Dark as all get out out there now. So tomorrow I'll pull the driver side valve cover and change out the coil on #6.
Then put it back together. Since it was down, I pulled the master cyl and vacuum booster to throw on a hydroboost. That part is supposed to be there tomorrow. Then I have to pull the turbo to fix a few things on the EBPV (stuck and linkage is apart on it).
But yes, you saved me by giving me ideas. Thank you much!