Nah its not the sensor mate if u mean the TPS as i changed it with a spare one, has the same problem when ive tried both, cant see it being the ISCV as it seems 2 do it when warm with it on or off!! could poss be an air leak in the inlet as a mate suggested as its intermittently doing it so gonna rip off the inlet manifold and re-do all the gaskets and take it from there!! gotta sort a couple oil leaks anyway so not like its going anywhere for a while

Has slowly gotten worse over time 2 so could poss well just be an air leak thats gotten worse!! will soon know anyway lol.