my 2008 Audi a6 3.2-liter engine was replaced ever since then we have been chasing multiple cylinder misfires. We replaced all ignition coils spark plugs twice changed the oil twice. PLEASE HELP ME IM RUNNING OUT OF PATIENCE...THE ERROR CODES START @ P2006 INTAKE RUNNER STUCK CLOSED BANK 1A ALONG WITH P0304 CYLINDER 4 MISFIRE NEXT P0354 IGNITION COIL D PRIMARY SECONDART CIRCUIT ALSO P0356 IGNITION COIL F P0355 IGNITION COIL E P050A COLD START