hi i recently bought a 2001 2500 w/ 24 v cummins, eng. has 230k new injector pump 15 k ago, fresh fuel filts on fass sytem. just cleaned air filt. smarty is set on 3, 275 hp. injectors. my problem is my eng. seems like it flutters or misses a little when driving at all speeds but runs perfect on cruise control. any ideas? thanks in advance. sinbad