I went today and had a oil change and engine flush at jiffy lube, when i left the jiffy lube, it ran fine, then i was driving on the highway, and all of a sudden, the car jerked violently, and lost power, i got off the highway, and turned the car off for a few seconds. When i turned it back on and started driving, the car kept hesitating, and when i floored the peddle to the ground, it took awhile to get to the normal speed of 65 mph. Now the exahust sounds like it has a high performance exahust on it, (rice burner sound) and has lost alot of power. This only happens while driving, when in park, car makes no noise. What could this be??