What could cause a 2006 Audi A4 2.0T to smoke, leak oil/fluid, and cause the car to be hard to drive?

Car was driving fine, then all of sudden, as I stopped at a red light, I saw smoke coming from the hood and my car was jerking and idling up an down. When I finally pulled car over, there was a puddle of liquid. It was oily and a orange/yellow color.What could cause a 2006 Audi A4 2.0T to smoke, leak oil/fluid, and cause the car to be hard to drive?Did you look at your thermostat? Not sure Audis even have a display, but if it was high on temp, it could have been a radiator leak. Some cars use "orangey-ish" color fluids in their radiator. Could be a leak in your radiator, or a loose hose connection. I recommend not driving that car till you get it fixed. Get it towed if you need to get it to a garage, itll be a lot less expensive than the damage youll be doing to your car if its overheating.What could cause a 2006 Audi A4 2.0T to smoke, leak oil/fluid, and cause the car to be hard to drive?i think car was at a great speed