how do i disconnect limp mode on transit van?

1999 ford transit van has go into limp mode been like this over a yr i always seem to do something to fix im pretty sure its throttle body is the prob since i had it seems hard to start like battery is low but i know its starter now sometimes i have to tap started then it will start can this also corse limp mode to activate?

the diesel pump leaks but not always limp mode hasnt been a problem for ages tends to happen if i put the accelerater down too fast is there an easy way to disconnet limp mode till i can repair?

Dean
November 2011