I agree that the manifold vacuum wouldn't be different with an intake leak because the throttle will maintain engine speed and therefore manifold pressure regardless of where the air is coming from. My guess would be an intake leak that is within the controllers ability to make the O2 sensors happy and prevent codes but leaves some cylinders running too rich. BTW, just thinking out loud about dk motors. If they were slugish from grime and operated slowly, could they create a condition of more fuel being supplied during their movement to the position that the computer thinks they should be at? Could this affect minute movements like maintaining idle? I understand that they are designed to create alarms at any sign of being too open but would a slugish dk motor be noticed by the system?
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