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The VW engine does not use a head gasket. The cylinders sit inside a recess cut into the cylinder head (this is called fly cutting the head) and a seal is made between the recess in the head and the top rim of the cylinder itself. If this area becomes damaged or overheated in any way, high temperature combustion gases leak out, causing burning of the head and cylinder top, requiring expensive repairs. The "running on three cylinders" you describe is typical of an engine with at least one damaged cylinder/head joint (assuming all cylinders have working spark plugs and the correct fuel/air mixture is being supplied).
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