Please fill out the following to ask a question. Gmc C5500 2005 204000 6.6 duramax Hi dudes! Im posting here because the heavy truck area does not respond. So i am hoping someone knows about heavy trucks here. Truck shifts okay from 1-2nd gear but once i get to drive and overdrive the truck jerks and doesnt shift until i let up on the pedal a bit. Only then it shifts. If i keep my foot on pedal or add more pedal, it just chokes out and will die out until i let go the pedal a bit. I know the tranny is good. I got some egr codes. One says egr low flow. Would an egr cause this?