2006 Chrysler PT Cruiser mis-fire

Wood typically would get crushed but if it hits a valve just right it will bend it. You can run that piston up, then fish around in the cylinder with a stick with thick grease on the end to pull the object out. If one of the valves is open, you can also try getting it out with a vacuum cleaner.

Is that a misfire you feel or is it simply setting a misfire fault code? If you think it's caused by a certain cylinder, start by swapping the spark plugs between that one and one of the other ones to see if the misfire moves to the new cylinder. If there's no change, do a compression test to see if one cylinder is low. If it is, a cylinder leakage test will tell you why. That involves forcing compressed air into the cylinder through the spark plug hole while that piston is at top dead center on the compression stroke. You listen in four places to find where the leakage is taking place. If an intake valve is leaking, you'll hear the air at the throttle body. If an exhaust valve is leaking, you'll heat it at the tail pipe.