I just got the spark plugs changed because my 2009 6 cyl. Jeep Wrangler (with 70,000 mi) was throwing code for a misfire. After the change, it doesn't run as smoothly as before. It chugs and skips, but does not stall. There are no warning codes showing up currently.
Is this considered normal for a vehicle with newly changed spark plugs? If so, how long should I expect it to take until it runs smoothly again?