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You need to first start with the engine codes and check for vacuum leaks. I'm positive the fumes are from the engine running rich. What is your engine's idle speed (cold and warm). Check all air bellows and vacuum hoses for leaks or cracks. Check fuel pressure regulator, and engine vacuum readings. Check the condition of your gaskets..... Valve covers, valve cover half moons, oil fill cap, oil dip stick, oil pan. These engines are very sensitive and any additional unmetered air throws off the air fuel mixture.
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Big Boyz with Bad Toyz. 
Last edited by BigBoy740il; 06-03-2012 at 11:58 AM.
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