I recently changed my rear ignition coilpack (used) i still had the misfire code because i believe the coilpack was no good because i drove for two to three weeks after the install and it shut off with no indication and will not start it only clicks from a relay in fuse box under thr rear seat. I am going to replace both coilpacks with new ones along with the spark ;lugs and boots and hope it starts. I used the meter and checked codes and it mentions both the camshaft and crankshaft sensor circuit but dont know why. Im wondering should i replace both too and maybe it will start then? I'm lost and dont want to spend thousands fixing do anyone have a clue?