Today I replaced the plugs on my recently purchased 85 380se (121k mi.) because after fixing the fast idle problem (thanks guys), it idles normal but now misses. I replaced the distributor cap and rotor. I noticed that the gap in the old plugs were quite wide,so I went ahead and replaced them w/ bosch supers. Slight change to worse resulted. Were these plugs set at the factory or did I need to regap them? I noticed on some threads, some of you went wider than spec, why? I will check your answers before buying new wires but they seem fine. (no arcing) Slowly but surely building a beauty!