Need a little help

[Bart_3500]

To all who have tried to help and watched this thread
Up before 5 a.m., coffee made and I'll be out in my 2400 sq ft garage here getting the old school parts ready just in case the "spit" hits the face this morning. I know Chevelle will love giving up it's carb for a correctly built TBI system that "I" will (re)build. Now I need to learn how to modify 'em. This is a GREAT site with some equally good folks sharing their knowledge. I WILL learn and will share what I have learned with others who, in the future, will be as unknowledgeable as I am now. Learning is a wonderful thing
Being retired now I get up at the same time 4:30 ish and I'm out in my "man cave" (so it's been called) by 6 or 7. I usually work out there until 5,6 or 7 at night. Doing so, and leaving lunch and beer (to a minimum) I've dropped 29 pounds as of this morning. I will admit that I fell off the wagon yesterday and had 3 or 4 beers but it didn't hurt me any as I'd been out there more than 12 hours

[EagleMark]

That is horrible news!

Maybe you will read this and give it one more shot? So the harness you have is all red or black wires? Ouch that would be hard to track down but could easily be ohm each wire. There is also a voltage check list in the $42 info thread where you found wiring diagrams. It could be as simple as one power wire not connected or one ignition on wire not connected?

AKDX is a 4.3L auto chip, would probably run, not well but not as bad as you are now. Now if the small chip your using is a V6? That would be bad, still not sure if it would cause the LHM?

Your so close...

[Six_Shooter]

Wrong cyl count, on either or both PROM or NETRES cause rough running. I was reminded of this the other night when I swapped $58 in place of $59 and forgot to change the cylinder count of the bin I was using from 4 to 6 cyl.

[Bart_3500]

Well, it's finished. ALL day at the garage, luckily the owner remembered me from years gone by and let me help with knowledge of what I'd done and thought. We check every connection again and ohm'd out all the leads. His Snap on reader wasn't much help, like everything else it said there was no codes. We replaced all the sensor one at a time and guess what? The LAST Sensor was the ignition modual and that cleared it up. Runs perfect again. In the past when my '90 FSB ate that ignition module I ended up at the side of the road. This sob was just running on "p**s him off mode". Now why would a sensor take a partial dump while changing out the harness? Just my luck I guess, but what the heck, I learned of a great web site and we're going to the Rubicon Sunday. Everyone's happy I have just one day to get everything ready.

[EagleMark]

Really happy for you that the rig is running, let alone making the trip!

EST modules are known for still working when faulty. If you had been set up for data logs I could have found that... well not on a stock 7747 as it does not have spark advance in data stream. But we did make a hack to put it there. I always install it on chips/bin that I do.

Have fun on trip and post some pictures when you return!

[Bart_3500]

Thanks, will do with the pictures after the trip. I'm out in the garage now trying to finish Bronco's minor stuff that didn't get done because of that part. I'd like to talk with you more later. Thanks again to everyone for the help and advise.