Jeep Cherokee XJ: P1391, P0340, Rough Idle & Backfire Diagnosis and Fix [Expo and the Unsolvable]

This is a 2000 Jeep Cherokee XJ, 4.0L Automatic We have the following OBD-2 codes: P1391 - Intermittent loss of Camshaft or Crankshaft signal P0340 - CPS Circuit 1 P0351 - Ignition coil 1 failure P0352 - Ignition coil 2 failure P0353 - Ignition coil 3 failure In this video, I (attempt to) diagnose and fix this strange and obscure issue, and demonstrate how to replace the Camshaft Position Sensor. Another thing that can cause this issue is the flex plate.