code 12 is diagnostic mode so that is not relevant. 45 is o2 sensor exhaust rich. I will post the website i use for the gm trouble codes. https://www.obd-codes.com/trouble_codes/gm/gm-2-digit-codes.php
94 tbi 350
- Thread starter 98k15
- Start date
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DerekTheGreat
Forum Regular
I'll tell ya what. Trade that POS to me for my '89 K1500 Shortbox, no CEL here and it runs like a gazelle 
magimerlin
I'm Awesome
X2... check the fuel pressure before you throw any more parts at it..
Sent from my SAMSUNG-SM-G891A using Tapatalk
Sent from my SAMSUNG-SM-G891A using Tapatalk
DerekTheGreat
Forum Regular
Nope, there is an adaptor fitting you can buy for it, I have one that I never installed but plan to the next time I have to have the TB off for any reason. I believe this is what I bought.. https://actron.com/content/gm-tbi-adapter-716
Can you leave this adapter on permanently or do you have to take it off when your done
Was cleaning out the truck tonight, found 2 ecms under the seat behind a set of jumper cables. Looked up the number on them. They were both correct for the truck. So I pulled the glovebox to look at the one in it, turns out it was not correct for the truck, swapped them off, runs amazing now, thanks for all the help guys.
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