all great responses!
also, consider that chryslers will throw lean codes with a misfire. When a cylinder doesnt fire, your cylinder turns into an air pump, so instead of O2 and HC converted to exhaust gasses you get straightup O2 and HC in the exhaust from that cylinder, so your 02 sensor sees too much oxygen and you get a lean code.
This can happen without a misfire code if your adaptive numerator has not been set (likely if you have not driven the vehicle much or at all following the repair and you had your battery discocnnected). To set the adaptive numerator accelerate at approx 3/4th thottle to about 35mph (with the gear selector in like 2nd) and let off the throttle, allow an engine brake for 10-15mph and do it again 5-10 times. After doing this if its misfiring you will get a misfire code.
That being said it could be ANYTHING that could cause a misfire, coil, plug, injector, cylinder integrity, vacuum leak, an unplugged coil or injector