INJ1 Fuse Blowing

[Dynomite]

Lee........I am starting from fuse panel downside to engine. When fuse blew I measured .3-.6 ohms and now after I disconnected DIS large wire connector with 1/4" bolt resistance came back to 1200 ohms on downside. But.....I was in middle of disconnecting lots of stuff and wiggling electric connectors so have to repeat that experiment. I put it back together again and fired the LT5 up perfectly and now cannot get fuse to blow again. I will try tomorrow and if I can or cannot get fuse to blow I will take a serious look at DIS connector as this seems heat related (most of the time).
And every time I remove the Plenum and monkey, I can drive the car a few miles before the fuse starts blowing again. Tomorrow I will wiggle, jiggle, pull, push every wire I can with the ohm meter attached to the downside of the fuse panel to see if the resistance moves at all from 1200 ohms.

What I know......it is NOT the Coils which are NEW MSD 8224s.
I did switch ECMs but did not run it with switched ECM.....I was checking back resistance from injector connectors to the ECM and found same on both ECMs.

I am now determined to find the cause one way or other.

Are DIS same for all years?
I am aware that ECM are the same for all years functionally as long as you have the appropriate years chip.

I am now down to about 6 minutes removing and 6 minutes replacing Plenum. And for those of you that have difficulty getting that throttle cable off the TB wheel......I rotate the wheel clockwise and place a screw driver between TB and wheel holding the wheel at full throttle and that cable (the cable/cables that have the end that has to be inserted through the little hole and wire inserted through the little slot) slips into place very easy

I am thinking there might be a pinched pin on the DIS which I will look closely for.

And yes Lee......at the moment anything is possible. The INJ1 fuse has blown cold immediately upon starting, warm ten minutes after starting, hot after 15 mile drive. I am just waiting for that fuse to blow when I open the doors
The injector being stuck does not seem possible given this happened under so many different conditions. And then it always unsticks itself even without the engine running. BUT....anything is possible.

What is of interest is the fact after I monkey under the Plenum it always comes back to life which would indicate the issue is under the Plenum. As erratic as this is it seems to be a component or connector that has or can move or the DIS. The trouble is that this issue fixes itself each time I start testing.

Today I was doing 80 a mile from the house and the fuse blew. I put it in neutral and coasted 3/4 mile into my driveway

Again.....I do NOT tighten the Plenum bolts very much at all and I have TB coolant blocked at Injector Housings........that is a MUST for this kind of work