So i have a 2009 silverado 2500 6.0l when im driving down the road i can feel the truck jerk a little bit around 50-55 mph. Then the traction control and engine light comes on and it goes into limp mode. this is with no load on the truck. when im pulling the travel trailer it has never done it and when im using cruise control it doesn't do it either. I have replaced the sensor at the throttle body. and i have tried to replace the accelerator pedal with an off brand but with that i couldnt even get it to idle correctly enough to pull out of driveway. I have a new GM pedal coming from rock auto so hopefully this will solve the issue?? one more thing after i get the truck to a safe place to pull over the engine idles really rough. does anyone know what is going on??

 

you need to run a diagnostic scan to see what the fault codes are