This article supersedes TSB 14-0077 to update the Service Procedure.
Some 2011-2014 F-150 vehicles equipped with 3.5L Gasoline Turbocharged Direct Injection (GTDI) engine may exhibit a hard to start or no start condition after using the block heater when temperatures are below -15 °C (0 °F).
2005-2006 F-Super Duty vehicles built on or before 3/15/2006 equipped with a 6.0L engine may exhibit a buck/jerk condition in Low (L), first (1st), or second (2nd) in manual transmission vehicles, or in manual 1st, manual 2nd, or in tow-haul mode in first (1st) or second (2nd) on automatic transmission vehicles.
This concern occurs anywhere from 1800-2500 RPM at steady throttle or slight tip in. Concern will be more evident under a load, or while pulling a trailer.