Originally Posted by renesis27
So quick update...I replaced the plug and beat the shit out of my car when it was warmed to proper temps and didn't misfire yet. Hopefully that fixed it. My other question is that the car feels sluggish and I'm not sure if it is due to the cold weather here in Philly right now...about 35 degrees. Also, anyone know any other possible issue with idle not being as smooth as it should be? I replaced plugs already and have replaced the valve cover gasket. Don't know if this has anything to do with it, but I was watching my spark advance and it was jumping from -3 to 2 and wasn't sure if that was normal or not..Thanks for the help guys!
Any oil leaks, like a valve cover gasket(VCG) will also cause a vacuum leak. Vacuum leaks will cause a rough idle. Maybe your VCG is still leaking. ?
It could also be the winter blends of fuel in your area. Maybe change fuel brands. ?
Sounds like the spark plugs were your issue.