I have some problems with the throttle pedal.
Idle is fine, but the midrange of the accelerator pedal is all judder or no power, then if you continue to push the throttle to the floor right at the end of it's travel it jumps into life and pulls like a train?

It is also fine when cold but the problem starts as soon as it gets hot, even sooner in slow traffic.

decided to clean the throttle body (this is also i think the potentiometer), i jet washed the engine on the way home before starting work and this alone cleared the problem for a day. But next day it was back.

anyone have any ideas?