Hi all, long story My Sapphire Cosworth is suffering from lack of power and is backfiring through the exhaust. I have only had the carfor a few weeks, and it was running beautifully initially. It first developed the symptoms on the way into the main ford dealers for its 60,000 ml service, and by the time I had reached the garage, a journey of 35 miles the car was really struggling not accelerating, loss of power, running roughly, etc. I explained the problem to the service manager who assured me they would look into it. I later got a phone call a 2.30pm that the car was ready, but when I went to pick it up, they told me that they hadn't time to fix the problem and I would have to book it in another day. They did, however, say that the turbo was alright. After the 35ml journey home again I was really toiling (the problem seems to get worse the as the journey goes on) and I was reluctant to risk running the car back to them again. I took the car to a local garage, who couldn't find anything much wrong, apart from a rusty fuel tank which was leaking and subsequently replaced. The symptoms I have now is that the car starts and ticks over ok, but won't accelerate above 3000 rpm and backfires through the exhaust if you do push the pedal down. The local garages aren't too keen to look at to the car they seem to be very apprehensive of a cossie and I was wondering if any one has knowledge of a similar problem. The car is unmodded and a red top, converted for unleaded. Thanks for any help.