How did you check the ground,Test Light or VOM?
I had a White 94 6 sp that gave me fits like this a few years ago (probly 8-10 years now) that I had all ready to deliver to a new owner and it just quit, after I replaced the Opti, ICM, Coil, Plugs and Wires still No start.Tom even sent me his back up 94 ECM because I thought mine was bad but that wasn't problem. Still NO GO! I've been looking for the thread to see what I finely found to get it running. (I've had 2 Hearty Acks and a mild stroke since then) This new software that Rob installed on the site is completely different and I can't find the thread it was in. I'll get in my files in the office and find the jacket to the car and find out for sure what I did,I've sold probly 250-300 or more cars since then. Stand By!
This is a recap of my posting on another siteI found it,It was way back in 07. The gang grounds on the back of the engine left side 2nd bolt up on bell housing. 6-7 wires. Replaced 3 eye connecters and cleaned the rest,R & R'ed the bolt stud in the bell housing cleaned, re-installed and hooked it back up! I'm surprised I didn't remember the gang grounds on the back of the block. God knows I've cleaned 100s of them.............
PS You may have to remove the cats to get to it!