Full parts cannon and still runs rough

[drdoom1337]

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If you haven't done this yet, it's the problem.

 

[PlayingWithTBI]

On a TBI motor you HAVE to disconnect the wiring behind the glove box in order for the timing to stick.

The later years TBI (93 - 95 IIRC) had the BLK/TAN EST bypass wire there but earlier ones had them near the trans dipstick tube inside the big wire loom. You may have to dig it out.

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[Blp378]

I would implore you to check the timing on the truck. On a TBI motor you HAVE to disconnect the wiring behind the glove box in order for the timing to stick. Then you can plug the wire back in. I believe it's brown. On the squarebody trucks it was on the firewall. I'm 100% certain this is the issue.

I will do that this afternoon and give an update.