Do you have any suggestions for what might be going on? I've checked grounds over and over again. New dizzy, wires and plugs. Any chance these wires got carbon tracked while I was still using the...

You are too quick for me! I just figured it out and was going to delete the question.... I realized I had accidentally clicked "load" instead of "manifold air pressure" for the x axis data type. Its...

Sorry guys for the slow update, I've been pulling my hair out with problems with the truck but after 3 weeks of problems, I think I got things sorted out and wanted to give you all an update. Truck...

I just got done doing a data log again and the truck idled the smoothest its idled in a long time! I had no idle change when spraying for vacuum leaks either! What still confuses me is that the BLMs...

I kinda figured that would be the case but it was worth a shot.
I had a different suspicion that maybe my coil or another wire was occasionally arching with plug wire 1, causing the timing to...

Do you think it would be the coil? Theres nothing else along the way with the ignition and it does it with the wire unplugged so its not like it can be anything with the computer or sensors, right? ...

Nevermind that! I got it running. I think the problem was that it was so flooded from the timing being off. I unplugged the injectors, turned it over for a bit, plugged them in, adjusted the...

Well I ordered the GMPP distributor and got it installed... truck won't run! It started at first but chugged a lot so I tried rotating the distributor and now it won't run at all and twice I had a...

Great to hear all that! Sorry you had to pretty much retype the same stuff for me to understand. Summit has both the delphi and the GMPP, listed as separate parts. The delphi is part number...

I have no doubt that I would rather go with a good one. I refuse to even buy one from napa, autozone or oreillys. So if I understand what you are saying, the '92 and newer ones will still work...

Thanks! I think I found one of my new favorite websites!

Thats awesome, its even cheaper than on Summit! Will that fit my '91 though? For some reason the delco on summit only fits '92 and newer and the ones on rock auto that you found didn't show up when...

Apparently this is easier said than done because all the dealerships in my area said GM discontinued them and they couldn't even find anyone in the area that might have one lying around! Any other...

Thanks everyone for your continued help!

I finally pulled my dizzy out to inspect things and sure enough, I have a crack in the magnet between the center of the reluctor and the star looking...

Do you run that with the completely stock ignition? How many miles are on it? I would like to keep them a little wider, but I don't trust my stuff right now because of the weird logs I'm getting.

Good points... I know mine is supposed to be at .035 but a couple months ago I decided to open it up to .045 and see what happened. I wasn't sure if I was a victim of the placebo effect, but I...

I just took it out for a run with the EGR on TPS% at 100% and the EGR never tried turning on so thanks!

Mark, which bin did you look at? All of my most recent bins I've had the EGR on temp maxed...

I haven't 0 out tables yet because I didn't want to make something go really bad if it tried to kick on and I obviously don't know what I'm doing.

As far as vacuum leaks go, I obviously made it...

I just got done doing a data log after attempting to fix the vacuum leak. It seems to be doing better and according to the BLMs it looks like its running less rich again. However, while I was...

I haven't relogged with this bin since fixing the vacuum leak (if it is fixed, fingers crossed). I feel pretty confident that it will be better once its fixed, but then again, I'm just a newbie. ...

I've been using spray can starter fluid. I figured, besides blowing up my face, truck, garage and half the neighborhood, whats the worst that could happen?.... I'll reconsider doing it that way. ...

I think my problem may be that a sprung another vacuum leak! I just retorqued my throttle body and EGR block off bolts and they both seemed to be pretty loose. Unfortunately I think the idle was...

I'll get started with a manual bin right away.

I've had the EGR shut off on all of the bins, including the "Option Word 1 - Bit 7 - EGR" in the last couple so I don't know why it continues to...

Today I did a new data log with that same bin but I tried to stay really light on the throttle (but still hit the higher RPMs) keeping the TPS% down and I noticed with my log that my 2000 RPM BLM's...

Thanks! I got the EGR test taken care of. The only reason why I pulled it off was because I couldn't get the gasket on it to seal because of what looks like rust pitting, so I had a constant vacuum...