I was playing with my predator yesterday after getting home from work. I was sitting in my driveway with the truck running and looking at the commanded rail pressure vs the actual rail pressure. I started reving the engine up and at between 2300 and 3000 rpm the truck was sputtering like the ECM was killing 4 of the cylinders. I had the predator 85 tune and the E/J on 0/5. Is this normal behavior?

Sounds like you're bouncing off the rev limiter while revving. Maybe:confused: Just a guess.

Do you have high idle hooked up? If you have it hooked up using the brake switch method you have to keep your foot on the brake to keep it disengaged...otherwise it will do as you describe.

Do you have high idle hooked up? If you have it hooked up using the brake switch method you have to keep your foot on the brake to keep it disengaged...otherwise it will do as you describe.

That was it. Thanks.