Miss fire low revs

[Keith Newby]

I wonder if it's the same plug misfiring two years later. Perhaps the coil pack the plug attaches to is intermittent. It might be worth the time to switch the coil pack on the bad plug with that from another cylinder to see if the misfire then transfers along with it. I think an OBDII check would point out the bad cylinder.

[heyjae]

You might have a bad plug from oil ingested into the engine from the bad AOS. If that is the case, the changing the plugs should fix it.