From what I've heard, those intake manifold gaskets are notorious for leaking. You said you haven't found any sign of a leak... check the oil to see if there is any gas in it. Good luck.
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1969 Chevy C10
1993 Toyota Camry LE
1999 Ford F250 Super Duty 4x4 diesel
2008 Dodge Charger Super Bee
1953 International R182
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