its not a petrol problem it isnt a sparky problem l dunno wot it is dont think its the ht leads it happens when im goin up hills any ideas?

change down a lower gear

try new shock absorbers.

by judder, do you mean it almost stalls?

or do mean some other kind of vibration? Some part of the suspension being worn?

Maybe the problem is only visible when the car starts going up the hill. Maybe there is something causing the fuel flow not to right at the beginning but which ''rights itself Gunk at the bottom of the tank, or iffy fuel pump?