2002 Ka Missfire, Any Views Would Be Apreciated

[Rob04]

Hi, I have a 2002 ford ka with the endura engine about 85k miles. a few days ago it went from running well to develop a heavy missfire, will not pull and the engine light has come on. with the engine running lumpy I can remove plug lead 2 and 3 and nothing changes, but when removing 1 or 4 the engine cuts out.

I have replaced the plugs, leads, coil pack, but the situation is still there. Any ideas?

Thanks Rob.

[nickjaxe]

I know you have replaced all the likly bits....but have you checked for a spark at the plug...to rule out any off those parts.