first off my truck has a new i.p. fass hd 150 pushing 20lbs of fuel presure and i installed a new tps. this only happens when its cold out but i get dead pedal after i put it in gear and it wont rev above 1800 rpm but in neutral its fine. it'll also happen when im goinig down the road sometimes. the rpms will drop and i cant rev it above 1800. not sure what it could be it only throws one code which is 0500 and the companion code 1693. i know the 0500 is a speed sensor or something close to that. could this be the governor pressure solenoid in the trans? i was told they can get stuck with some clutch debris or when theyre going bad temperature can affect them. just had a tranny flush a couple months ago and it still does it. if anyone else has had these problems please help. thanks