Hi could anybody please give me any advise, the problem is that i have had to change the head gasket . The engine was rebuilt to the letter . the timing was set to TDC and was not moved at all. New seals were fitted to the injectors . (the only thing different is that the head gasket was not an original one).Anyway the engine is now rebuilt but wont start, there is an initial fire but then cuts out almost immediately.can anyone help , ive chcked all the connections and are all fine.