Long story short--- Check engine light came on and come to find out there is a misfire on one of the spark plugs. Truck has 80,000 miles on original spark plugs so I conferred with the mechanic that he should go and change them all and the coils too. All done and went to pick it up yesterday and as soon as I turned the corner the engine light cam on again. Took it straight back and they put the code reader on it and it said misfire on # 3. I do not know if it is the same spark plug from the start or not. What could be the cause of that even though everything is new? Any suggestions would be greatly appreciated.