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If it isn't one thing it is another, lol. My latest concern is when I blip the throttle from idle on my 100 BN2 there is a small puff of black smoke coming from the exhaust. This was not there until recently on my freshly rebuild engine with 3300 miles on it. It clears if I blip the throttle a few times but returns if car idles for just 10 seconds or so. No smoke at idle that I can see. All four plugs are gray to coffee color with just a small ring of carbon on outside thread edges. Can only be seen if standing at back of car and just started I believe? Thanks Marty