MIL came on ,code was PO156 O2 sensor,bank 2 sensor 2,light goes off for few hundred miles, then comes on again for 75 +- miles,stays off few hundred miles.Driving expressway at 75 mph engine light starts blinking, engine begins rough operation,at idle engine very rough almost stalling.engine temp. normal.,after cooling I started car i noticed the # 3 cylinder intake pipe was very hot to the touch ,other intakes were cool, clicking sound from area of # 3 . I installed new wires plugs and coil. Could it be a broken valve spring of carbon blocking exhaust port ? Car has 230,000 miles, alway used synthetic oil.
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