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exhaust manifold leak

  1. O

    5.0 lean codes a mile or so after restarting... otherwise fine!

    Hello fellows! Got a small conundrum here, and hope someone's willing to help out. My 2000 Mountaineer with 187k on the clock just got a new (stock style) exhaust from the headers back. All 4 O2 sensors are new. EGR valve & gasket, upper plenum gasket and elbow to plenum gasket, fuel pump and...
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