Dont know where to start: recently had my 1995 opel kadett 160i(single point), 306000km engine minor overhaul. Had big ends, rings, valve stem seals and guides fitted. Also new plugs and leads. My no3 cylinder is not firing ive changed plugs and still nothing there is spark from the plug when connected to the lead. When I start it, it always misses and is under powered. Once she warms up its fine. With few or now misses. When I pull the number 3 lead off while the engine is running there is no change in the engine. All other leads cause an effect. Thus pointing to the number 3 being a problem. Please I really need your help. Really struggling.