Hi, I just had the unit scanned and it came back with P0300 - Cylinder misfire(random)
The plugs have not been changed in 2 years so is that a good starting point? The vehicle has only 100,000 miles and is a 2000 Jimmy Diamond Edition 4.3 L
The trouble light usually resets after a week or so but comes back on when highway driving up long hills.
Any pointers greatly appreciated.
Thanks, Rick