Truck has been doing 150 miles per day for 3 months, whilst cruising at 70 mph service engine soon light started flashing on exiting the freeway the car was idling erratically and almost stalling, it eventually quit running and is now difficult to start and runs lumpy, What system is messing up?
SOURCE: Service Engine Soon Light
The best way to know what is happening there is to drive a GMC dealer and get them to hook in the diagnostic tool and read the computer memory for present faults.
Cheers
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