toilet problem
As MdangermouseM,said, "it may be gunked up causing a plug at the vent"
If snaking the horizontal drain doesn't do it, try looking down the KS drain at the water seal and have the wife flush the toilet, if the water in the trap bubbles or noticeably ripples, chances are it has an individual vent that is plugged or partially plugged, If you remove the trap and horizontal drain to a point where it connects to the vertical drain you may be able to feed the snake upward into the vent.
These problems are usually easily diagnosed when your able to see or figure how the sink drain is connected. Good luck.
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