2009 prostar isx crankshaft sensor issue

[Notch]

I've seen a similar issue and without getting into specifics can say that there are torque reduction requests that can be made by the ABS module to the ECM that can reduce power based on things like the lean angle of a truck through a turn at a given speed. And that these parameters are not always set properly when changing programs. Either way, it sounds like you should really pull your file and have it reviewed before spending any more time or money looking elsewhere for a problem that has stemmed from the one major thing you've changed.