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thanks Steve I've disconnected the fuel line to the fuel rail there's fuel there I've took the plugs out and cranked it you can see them firing away if i start the engine with the plugs in it sounds like its running on two cylinders then cuts out if a disconnect the coil packs it spins over like it should do I've changed the crank sensor for another replacement to see if that des the trick I've also checked the voltage to crank sensor cam sensor and coil packs I've got a healthy spark its definitely something or nothing will keep you posted got to be timing related thanks paul

Yep. I've just had my (to date Audi Main Dealer serviced) car serviced by my trusty local mechanic that i've used for many years. I was there with him as he carried out the service. The filters removed were absolutely disgusting. Full of what can only be years of crud. According to my service book, Audi 'serviced' the car last year and filters were changed. Absolute garbage. My mechanic was also convinced the fuel filter had never been changed. Ever. Despite what the service book said!

Think you're just going to have to bite the bullet on this one and remove the head. You may as well changed all of the seals for peace of mind and to prolong the cars life.