 you should have all the cat. converters checked for clogges,ie rear 1 it will blow a hole in egr valve.  costing about 285.00 ,  i had mine removed and replaced with pipe .  resolved issues.  cts will clogged from unburned gas causing motor to shut down.  this pipe trick does the job.   all happened at 121k.  also keep gas filter changed. its on frame, easy to do.