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Was it REALLY black or just dark? I've seen blue smoke (oil) described as black. More times than not, if a puff of blue smoke is found its when you let up off the throttle and that can be an indicator of valve guides. Should you be worried? No. Should you check into it further? Yes. I would pull the spark plugs and look for oil (wet) or carbon from unburnt fuel (black and sooty).
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Joe
See Porsche run. Run, Porsche, Run: `87 911 Carrera
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