dan escort gti

iTrader: (1)

I have a series 2 rst an 1 morning wen i started it an run fine until it walmed up then it started to miss fire on the way to work. the engine had done over 100,000 miles anyway so i decided to just rebuilt the engine an the hole bottom end is now brand new, every part has been changed its had a new head, bran new piper 285 t2 cam, double valve springs, new valves [all 8] an checked all wiring conections an all is fine. wen the engine was put back in it dun the same as before, started to mis fire wen hot. after that i have spend weeks changin every part under the bonnet to try an find the problem but nothing has solved it.
does any1 have any ideas or had the same problem b4??
even da slightest help i will be very greatful as am starting to get fed up with the car lol