I really need help with this one.My soon-to-be Mother-in-law banged a pothole VERY hard,and since then,it runs rough.All through the RPM range.Even worse in reverse.Checked the codes,and nothing showed.What could be jarred by a pothole that would cause an engine to run like this? Guys,any of you with mothers-in-law know why it's important for me to fix this quickly and correctly!