I need advice, please.

[octobers fade]

I really need some guidance
This is kind of long, but I am so frustrated with the way things are going.

 

 A month ago my transmission started shifting very rough from 1st to 2nd and back again, now it had been doing it for way too long just not that bad, so I brought in to a shop to be looked at. I was told it was a bulging situation and it would have to be rebuilt. It was rebuilt ($4,500) and I was told to bring it back in two weeks for a check up... day 13 after a couple of errands I start up the truck and its running rough and the check engine light is blinking.  I bring it in for the check up and engine light, they tell me it needs a tune up (plugs, wires, and ignition coils $!,050) and we proceed and  have it done. I drove it home, all is good,  it sat for a day, and the following day I ran some arrands and the same problem arises again. I am now told it's a bad injector... OK replace it... doesn't work (no charge since the tune up didn't fix the problem) and they  now think its a computer problem. Two computers from the junk yard don't take, now a computer from the dealership ($500+$178 programing) installed truck runs for a couple of pit stops and the same problem happens again, so back to the shop. It's another injector failure, I say replace the remaining five and be done with it. While working on the injectors they break a harness clip and order a replacement harness  and once installed, with the five remaining injectors they give me my truck back (no charge) and before I can make it home it happens, yet, again. Bring it in now they think the rest of the injector harness' are bad and they are replaced (after shipping the wrong one and shipping delays $150) and once again a half a mile later all the same symptoms return.
Now I take it to the dealership just to get this over with, they scan the computer  and discuss the situation with management, and tell me they  won't touch it, because of all the work that's been done by LCT, they don't want to get involved. They hand me the printout and I return  to the shop and he tells me that is the same codes he pulls up and takes it back in. Now I am told the main harness needs to be re wrapped.
This has been over three weeks.

Has anyone had a similar experience that I can draw from to get this rectified?
Any help would be greatly appreciated.
Thanks!!

 

Edited May 22, 2023 by octobers fade

[Snowcamo]

You need a different and better shop. Sounds like your getting the run around.

[rlcole321]

I'd say, try another dealership, try to find a Large Chevy dealership. If you contact GM (GM Support Center: Vehicle How-to, Information & Help) they might also get you to someone to help you.