2000 GMC 1500 4.8 4L60E, starts up and seems to idle fine. Once you put it in gear it will slowly start to drop rpm and then try to pull through the brakes. Any insight would help. Parts cannon includes new IAC, TPS, MAP sensor, both upstream O2s, MAF, plugs, wires, intake gaskets, TB gaskets.
Adding all of the relevant idle parameters, and TPS, and trans current gear, and TCC status, and a whole slew of other stuff to your logs will help transform this into a solvable problem. Need data to diagnose and it's just not in those logs you posted.
My very first guess based only on your description would be: TCC stuck on. And that can happen from an internal fault even with the scanner showing TCC status as not applied.
I don?t think it?s the TCC. I pulled the lockup solenoid out and check the lockup valve in the pump to see if it was stuck. Still was doing the same thing it usually takes it a few seconds before it starts doing it. No an immediate think.
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