BAD IGNITION COILS AND MISFIRES. CAM FOLLOWER AND CAMSHAFT WEAR PROBLEMS. DIVERTER VALVE (DV) FAILURE. HIGH PRESSURE FUEL PUMP (HPFP). CARBON BUILD UP AND COLD START MISFIRES. INTAKE MANIFOLD RUNNER CONTROL (IMRC) MOTOR. TIMING CHAIN, CHAIN ADJUSTER AND TENSIONER. VW AND AUDI FUEL PUMP CONTROL MODULE. PCV VALVE FAILURE.