i get misfire codes for no 1 and no 3 cylinders went out and drove car hard came back pulled plugs out and no1 is covered in carbon and no2,3,4 are red could it be the coils or should i look somewhere else
Spark plugs with red colored deposits are caused by
some of the newest motor oil additives, nothing to be
concerned about, normally.....
If one plug looks black, it's probably time to replace.....
