I hit a bump today on my way to work and in the area in the gauge cluster were it has the miles said "Reduced Power", it wouldn't go past 30 mph, and the engine shook real bad. When I went outside on my first brake to see if I could find anything wrong it ran fine and didn't say it anymore, but the engine light was still on. I got home and let it sit for acouple hours and turned it on and the engine light was off. Any idea what happened??