I have a 2001 Pontiac Sunfire GT,2.4 liter 4 speed automatic. As i was driving down the interstate this morning i felt a jolt (like a slight shift). I thought that maybe a tire had blown. The car started losing speed as the engine excelerated. I ended up coasting to the side of the road. I can put the car in any gear and it won't move on it's own. It can also be hand pushed while it's running and in any gear(including park). It will also idle at 10mph in 1st.,18mph in 2nd. and 20mph in 3rd. or drive. Has anyone had this happen before? Thanks for any answer.