im hopin some1 can help me i have an intermitent problem with my s1 the engine doesn t have to be hot or cold for it to happen ever so often my car when holdin on boost will start 2 run on 3 cylinders and have a big missfire i thought it was spark related at first but i have changed plugs, leads, rota arm, and even dissy and it still happens. i then thought it might b a fuel problem but i have tryed changing every thing 2 do with the fuel system and the problem still occures. im now thinking it may b a wiring fault.

is there any1 else that has had a problem like this and can help