Thanks for replying Old Master. Update - My kid drives the truck yesterday. Starts out fine and then all of a sudden the engine starts shaking and stalling. Goes back to the mechanic. They replaced the EGR valve that was stuck open and not working. Supposedly everything is working now. He took it for a 10 miles spin and is going to drive it again tomorrow. I'm hoping this will resolve the problem. He replaced something else on the P441 code (bad cell phone connection) but I'll get more info when I'm picking up the truck and will report back.