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head gasket leak can occur when compression is high while you are driving. a really bad gasket leak will leak compression at idle and will smoke at idle. it could be that when you punch it, the head leaks, and you get white smoke (white smoke is steam from oil and coolant mixing up) check your oil, if it looks like chocolate milk, you gotta bad head gasket. or, it COULD be going bad. check your water to see if theres oil in it.
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