[gmtech1]

The traction light and cel light came on because of the rough idle/misfire. The evap system will not cause a misfire. The PCM is located inside the r/f fender, the inner fender will need to be removed to access it. It's possible there is a problem with a connection in there that was aggravated by the bump. I would look at all the connections and grounds, anything loose. Should also have the code read to beb sure what you are after.