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Message: <blockquote data-quote="Tazza" data-source="post: 1416" data-attributes="member: 82">I too would suspect valve stem seals, blue smoke indicates burning engine oil. If it was diesel fuel it would burn black if it was rich. Over fueling will puff black smoke (or blocked air filter), un-burnt fuel blows white smoke, burning engine oil will puff blue smoke.As StuZ says, worn or hard valve stem seals will leak engine oil down into the cylinder over night causing excessive smoke at start up that will continue until it has all been burnt out.It shouldn't cause the engine to miss while warm, as the amount of oil leaking down shouldn't do anything but blow a small amount of blue smoke.</blockquote>