Hi,
just an update,the rotor arm has done the trick,no more hesitation. I changed the cheapest thing first as recommended by our John ! Thanks very much indeed John
I bought an Intermotor rotor arm off ebay for £3.50 fitted it today and the Audi is running like a Swiss watch ( touch wood...I don`t want to jinx it ). Maybe it`s not the best make but it will do for now. I would like to thanks all the guys that replied to my post and offered possible solutions . You guys are the ones that make this forum so good.