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Blue smoke is going to be oil, not coolant and therefor not as likely to be a head gasket. When you pulled out your old plugs and wires was there a lot of oil on them??? Most likely you have junk spark plug tube seals and your motor is leaking oil into the combustion chamber via the spark plugs. As far as the high idle and shifting problem, I'm more likely to think that's related to something else gone wrong under the hood. Throttle position sensor being one possibility.
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