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Re: 72 all wired with tbi couple of questions
OP needs to get the diagnostic port and the check engine light connected. Unit should have a 1227747 computer on it. We just did a swap (87 350 TBI to 80 Chevy 1/2 ton. Went flawlessly. OP said something about a red wire going no where. Might very well be a large part of the problem. Also if there isn't a O2 sensor hooked up, that will be an issue too.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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