I recently had my quad do something funny. I was playing around the other day with the box set at 100 and going WOT when I let off the accelarator, the engine redlined.
Has anyone else hda this happen?
This is the first problem I have had with the box.

 

Mine does it anytime I quickly rev up past 3000 rpms. I was told it's normal. I try to tailor my driving habits around it and I rarely have it happen anymore....

 

You have to realize that when the rail pressures up to 23-24-25-26K it takes it a second to de-pressurize. If you beat on the truck stock you will be able to notice this but, it is definately enhanced by a power module.

It is worse at redline if you jump out of it but if you stab the throttle hard in a parking lot and then jump on the brakes you will see the same sort of behavior, stock or modified. It is sort of a thing with Common Rails.