The recall involves vehicles fueled by gasoline or natural gas and equipped with speed control, including the 1994-2002 F-250, F-350, F-450 and F-550 F-Super Duty trucks, 2000-2002 Excursion SUVs, 1994-1996 Econoline vans and 1996-2002 E-450 vans, and 1998 Explorers and Mountaineers. The recall does not involve similar vehicles fueled by diesel.