Hey guys! I need some help with my Dad's truck (2001 2500, 4x4, extended cab, short bed, 6spd, Banks Pwrpack). He's been having some trouble with the truck stumbling off idle when cold. It almost feels like the filter is plugged, but I changed that and no luck. Once it's warmed up it runs great, but it's only when cold and not up to operating temp. Do the grid heaters cycle the same as my old 1st gen? Any help would be great.