also check for exhaust in the cooling system. this usually only causes higher speed issues though. but if the engine was overheated as the builder said, could be cracked, but you think he would have seen that. it could be a crack or head gasket leak, those don't always cause exhaust smoke. NAPA has the coolant testing kit for like $55, woth the investment.
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hmmmm.... which car do I work on today? -answer: all of them, they all need something
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