Vgt spazzing out.
 

Anyone ever have this problem??? I usually run it unplugged but I really need my exhaust brake and this is what my truck does runny or stopped when the servo is plugged in.. I put it back to stock a few months ago to smog it and it worked fine even after I put the straight pipe and tuner back on for about 300 miles then went all screwy again randomly. Thing sounds like a damn Type writer.