1998 Acura Integra Engine Idles Rough

It's a very mild idle, just a noticeable vibration when idling, she drives smooth as can be though. I especially notice it on the shifter knob.

Timing belt and water pump have been changed recently.

Noticed a little bit of oil (not heavy at all, it seemed thick almost) on the threads of the sparkplugs on cylinder three and four. Car does not appear to be leaking any oil though. No check engine light either.