Will your tune tell you what cylinder or cylinders are misfiring through a Log? Most of the time its plugs, coils, injectors or a combo. If you can read the missing cylinder swap the coil with another one not having a problem to see if the issue moves with it. If it moves its the coil if not it could be the plugs or injectors.
In the case of the 335 with a tune after about 25K miles the plugs are history.
2013 BMW 135is 6MT conv JB4/ISO
2011 BMW 335is DCT Coupe JB4/ISO/BMS Flash
2009 Ford Expedition 4X4 EL - 2009 V-Star
2003 Nissan Xterra 4X4 - 1998 Ford Ranger 4X4 Splash
FF Cobra Mk-IV work in progress
Last edited by bear-avhistory; 11-15-2012 at 04:25 PM.