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Answered 2008-09-06 13:21:41

Several possabilities. One is a bad PCV valve if it leads to that bank of cyl. Another is the intake gasket for that side of the engine. Worst case, but not likely as it is affecting all of the cyl, is a failed head gasket. One question, are the plugs fouling with fuel or oil? If over fueling, it could also be an injector or injector wireing issue. Could it also be bad oxygen sensors? If there are four oxygen sensors on this van, and the one for the right bank of cylinders is giving the wrong reading, that could cause this problem. Seems unlikely, though.

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