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View Full Version : E38 Power Cut at 4000 RPM



thunder57
March 6th, 2023, 07:39 AM
Having a hard time getting an issue figured out. Seems like the truck has something limiting power around 4000 RPMs. It pulls fine until then and it just cuts power, falls right on its face.. can even hear it in the exhaust. Here's a rundown of the specs, base files and datalog.

Beating my head against the wall for a while on this, any help is appreciated.

2008 Sierra 2WD
6L Stroked with 4" rods and .030 over - 10:1 compression
1.72 Roller Rockers
12609749 injectors
comp thumper cam - MK54-700-11
Long tubes and Intake
4L80E trans PCM of NC adapter harness
3800 Stall