has any one had flywheel vibration make injector rates go crazy seems like all balance rates are good then all 8 go crazy at same time then all 8 return to normal after 10 or15 sec sounds like a lope tune already replaced fpr any ideas

i guess nobodys ever had this happen. i think flywheel vibration is messing up crank senser making injectors compesate which makes it lope seems to come and go every 10 to 15 sec. took to dealer today they don't seem to have a clue. loaded all new updates from gm but no luck. any ideas?

Mine did. About 4 or 5 yrs ago. had bad vibration, checked balance rates and they were everywhere. took it in figuring injector problem causing all the vibration, turned out DMF. Replaced, ran smooth.
Just so happens, this morning, started it up, whole truck loping at idle, need to check rates, but suspecting 2nd DMF bad. Runs fine off idle. Looking at South Bend Clutch this time.

Im getting my vibration again and its got to be from the dMF.. so This time (3rd) im going with a SMF from south bend clutch.. Not much more then a whole kit elsewhere...