hello martin, thanks for reading. Yes, have checked ignition leads, can't remember the exact figure but they were uniform across the four plus king lead. The coil is a gen new grp A item. It's well mounted so shouldn't be any voltage problems it's directly responsible for. Mine is a 4x4, but has the 2wd TPS!! What tests can I do to it to see if the reference signal is being interrupted/breaking down when the switch is used quickly? What voltage and or ohm's am I looking for? Only reason I'm leaning towards this is the car will gain speed and pop along quite healthily if you very gently apply throttle, but if you try to quickly half or full throttle, it just misses. If the ribbons inside the tps are worn, and the reference point on the sweep arm doesn't get a clear signal of it's position, that would make it pop and fart wouldn't it?