The check engine light has never came on, however I did check the codes and found no codes stored. (code 12 only) Also, I checked the resistance on the plug wires, #1, 3.75k, #2, 7.08k, #3, 6.15k, #4, 6.05k, #5, 7.26k, and #6, 6.99k. Are these readings OK? If not, could this be the problem?