HACK BLOCK
Full Access Member
2011 yukon denali 115k trying to determine if I need new plugs. used my tech 2 to check for misfires and after two 35 minutes drives on the highway I came up with just 1 misfire. does this mean my plugs are still working fine or should I still change them regardless because of the mileage.? just trying to make a maintenance list
for the car
for the car