drdoom1337
Newbie
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If you haven't done this yet, it's the problem.
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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.On a TBI motor you HAVE to disconnect the wiring behind the glove box in order for the timing to stick.
I will do that this afternoon and give an update.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.