Hello and welcome.

When the car is started with throttle assistance does it stop if shut if so most likely ISCV, as your problem sounds fuel related I won't touch on the ISCV as the below may sort both.

Besides the plugs which you have changed and to one of the best ones possible as well (071's), what gap have you set? the rest of the ignition system needs to be in perfect order on these as it's not great. I.E Rotor arm, ignition leads. Also good idea to change fuel filter, this is often overlooked. Other thing it could be is CTS but do the above simple checks first. Do you get black smoke out?


Most important thing of all is to make sure fans work, should be rewired ideally if not already done, same applies for fuel pump.

Martin