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UPDATE: Took out passenger side intake manifold. Found vacuum check valve was disconnected from hose for secondary air. The valve was also passing a bit of air both ways so I replaced it for 17 bux. Seems to have solved it so far at 104 miles (past drive cycle). To get to intake manifold head bolt by firewall, reach around with your hand. You do not need to take off cabin firewall access panel.
Jeff
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