Sounds to me like something is fouling the throttle assy or kickdown cable causing it to jam open.
Another option is in sub zero temps the positive crankcase pressure gases contain moisture which can freeze when they reach the cold throttle assy and freeze the throttle flap.
__________________
Dave...
Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident
|