It's too late for a plug or patch because the slime can't be cleaned off.
It's not easy to see an out-of-balance tire when following another car. It is pretty easy to see a sideways wobble. This could be a bent wheel or a broken belt in the tire. It is common for a patched tire to develop a broken belt. Water and salt get into the hole and corrode the steel belts.
Have a tire shop look at.
Monday, March 30th, 2009 AT 1:28 PM