driving along the engine cuts out, holding the accelerator pedal down nothin then sometimes it comes straight back on.if i try jump it when it cuts out nothin but turn the ignition off then back on starts straight away drives then cuts out again.

took me ages to get home

its had a new chip, plugs,grp a coil,dizzy setup 2 weeks ago been running great

could it be something to do with my immobiliser?

 

Check to see if your fuel pump is running when you turn the ignition on, it should buzz

 

When it cuts out, what does the rev counter do, does it drop like a stone,
jump around or look normal ?

 

fuel pump is good, when it cuts out the rev counter drops at a teady rate (normal) it cuts out on tickover or when driving hot or cold