My 97 9000 2.0 CSE has overheated. This caused the head gasket to blow and the head to warp. It also damaged the turbo, which now leaks oil. The head has been re skimmed but the engine missfires on one cylinder. The injector was swapped but the same cylinder missfires. The mechanic and I think the engine management computer is to blame for the whole ghastly show. Can any kind person help tell me where to get a reconditioned computer and turbo or get either mended in the London UK area. I am as they say as sick as a parrot.