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  1. 2013 Armada Runs fine but has P0300 Code - Altitude

    2013 Armada with 90k miles. Driving down from the mountains yesterday, the check engine light came on with error code P0300. We did a day of driving where we ascended then descended about 4000 ft (topped out at 8000 ft). The truck is running fine, with no indication of any issue; at idle, at...