2004 stratus vibrates on start up
I recently noticed when I started it today that it was vibrating and pretty rough for about 5-10 seconds, put it into reverse and was fine. I also noticed a slight knocking noise from under the hood when this was all happening but that stopped within a few seconds of start up. Any ideas what this might be? I recently replaced spark plugs and wires about 2 months ago. It's a 2004 stratus 6cyl.