will try both phase and tps sensors, I have no fault shown by the warning light that is what is confusing me, I travel armed with a multimeter and a wiring diagram ready for it to go, but so far cannot find anything wrong, it is really annoying but I will get there in the end. It is a full ignition cut that I am experiencing am getting no spark at all when the fault occurs, Fuel filter quite new so I can rule that out thanks for advice.