Thanks for reading... I have a 99 Dakota, 3.9,4x4,manual that recently hasn't been performing as she used to. I borrowed a code reader and came up with these three error codes: P0301 = Cylinder 1 missfire, P0138= O2 sensor heater bank 1 sensor two shorted to voltage, P1391= Loss of Camshaft crank. I am wondering if these are related or individual problems. Can anyone please advise me to correct these issues? Thank You