In '86 they offered an optional computer controlled carb setup... I don't remember all the details anymore ( I've tried to forget that nightmare) but if I remember correctly it had the ability to adjust the fuel mixture and I think change the timing ( correct me if I'm wrong please). I unknowingly bought one of these bastard child pickups, and never successfully got it to run right. I even bit the bullet and took it to three different shops, had it rebuilt and even bought a rebuilt replacement( for a small fortune) and still noone could get it to work right. Finally tore all the crap off of it and just put an edelbrock intake and carb on it and never looked back... Sold it to a friend of mine and he's still driving it six years later.
The carb has some additional wires running to it, and there's an ECM up under the dash behind the glove box. I can't remember anymore, but I know it had a knock sensor and I think it might have had an oxygen sensor?
