You may have an issue with the dpf system, you need to get that looked at.
It may be plugged, needs removed and baked out.
When was the last time the dpf went through a regen cycle?
as for the surge, it sounds like the dpf system may be full and about to put the motor into a limp mode.
Last edited by 97cummins; 07-15-2013 at 02:25 AM.