White smoke....
Is it possible that the white smoke could be steam??
Then as Okie say's it could be a head gasket gone that is letting coolant steam through the exhaust system?
If your not losing coolant the white smoke normally points to a weak fuel mixture, some kind of restriction in the fuel supply line? Have you checked your fuel tank breather tube? If air cant get into the tank to replace the fuel your taking out then a vacuum is created causing stalling, rough running & white smoke? Worth a look. Also check your fuel filter if you haven't changed it lately.
I don't see it being a cat. convertor, but I've been wrong before!!
good luck,
Andy
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