Check engine light flashing at 50 to 60 mph

Asked by Jul 14, 2017 at 07:30 PM about the 2003 Chevrolet Silverado 1500HD LT Crew Cab Short Bed 4WD

Question type: Maintenance & Repair

P0300 code.. replaced wires plugs coil packs fuel filter o2
sensors .knock sensors cleaned the plentumn and all
injectors tested them all and are in man specs.. cleaned all
the grounds new air filter.. now have a rough idle ..scanner
says no misfires in any bank while running .. helpnext
purchase might be some tnt..

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