Thanks guys, I gave him your numbers. I know he was working on a tractor or something right now but should call today some time.

from what I understood, it usually happens while under load, with ambient air temperature above 60-70. He will be driving along and then the acceleration power will die suddenly, but the rpms hold. He said if he pumps the gas a few times all of a sudden it comes back.
doesnt happen in colder weather. TPS sensor has been replaced and I think a few other sensors. They mentioned the fuel injector pump but it's $4500 and wouldn't guarantee it would fix the problem.

i told him my thought was the waste gate where it cuts power from the turbo. And I believe the waste gates have issues on these motors.



Should have bought a duramax!