This is a wierd problem for me. I had this happen once while driving. It feels like the throttle cable comes disconnected and the peddle has no use. The Van idles nicely and actually will move under its own power but won't rev in gera. It will engine and rev out of gear ( 5- speed) . I get a flashing glow plug indicator on the dash. I turn off the engine and restart and wait a bit and all is well. Is it a Throttle position sensor, Turbo waste gate stuck, ECU? Any help appreciated. 2001 LWB Van 200K.