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jdragon, yeah new guide pins were properly lubricated with silicone grease and copper grease added to the cradle. Sometimes I do think I can hear a somewhat dull sound when driving, but I'm not sure if this is in my head or not! Gareth, I'm going to take the disc off again and have a look. I did give it a quick wire brush down at the time but I maybe did miss some rust on the hub surface. The wheel bearings was just an out of the box suggestion, as I'm totally stomped with this lol AudiJackAvant, given how similar the parts you replaced are to mine, I'd say it's a good chance we may have the same issue. Crazy how difficult such a simple problem can become! Cheers folks for the suggestions

Hi, I got an independent engineer out to check car, it cost £240 but he informed me that the garage that did repair has left my car in dangerous state, he said that they had not tightened locking nut on one side but they should not have let car leave the garage. I had car recovered to a garage (I contacted my insurance company that I have breakdown with) that has carried out few jobs in past couple months who has diagnosed fault and is in progress of repair. This garage said there is no damage to steering etc. (Thankfully). I am waiting for report from A. C. E the company that checked car, and I will be forwarding copy to original garage. Thank you again for all who replied to my query. Anthony Price

In summary: cold starting is fine, hot starting is erratic, and the engine runs well once started. If that is correct I suggest there is an electrical or mechanical problem, though that doesn't narrow the field down much. ECM, mass flow sensor, crankshaft sensor, exhaust sensor, fuel injector, and many more could be at fault. I doubt we shall arrive at a firm diagnosis from discussion on this forum, and guessing at answers will be expensive for you, so I suggest you get it tested at an Audi dealer or independant Audi specialist. Do not use on an OBD reader from Ebay or the like, they are unreliable.