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Running into a couple of problems hoping someone here could give me some info on what to do.

Took a lq4 6.0 and 4l80e out of an 01 Chevy HD.
Swapped them into an 05 tahoe.

Problems I'm having are
Engine skipping with no data of missfires
Knock sensor codes with no miss fire codes

Transmission
According to data the trans is switching back and forth between park and drive when the truck is in drive.
Also giving bad temp and pressure readings.
I did the adapter harness and pinned the ecu for the speed sensor. But not sure if my problems are going to he programming or external.

Thanks for your help in advance.
 
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