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2005 GMC Envoy..stalls while driving 45 mpg.?

2005 GMC Envoy…recent problems include engine light, brought it to the VIP and read code for cam shaft sensor, went to the dealer and had it replaced! The next day it stalled while I was driving 45 mph, had to coast to a stop and park to restart, has happened four more times, dealer now said it is showing three more codes. Accelerator, instrument cluster and wire fuel pump controller??? what is going on here…any ideas?? -