Been having trouble with a 2011 Savana with an engine surge at light throttle pressure from 1,200-1,600rpm. You can push through it by adding throttle. The dealer said it needed the the fuel system replaced. That was done. Only to have the problem still there. We replaced the crank sensor...
New issue with our fleet of Duramax. We now have a truck that has a hunting problem at idle in gear. We have had several with fuel pump failures, lots of EGR valve issues due to the high idle time. Does anyone have any experience with this condition?