One problem related to engine noise has been reported for the 2011 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Ford Mustang based on all problems reported for the 2011 Mustang.
I was traveling on a major highway at the speed limit (75 mph in this area of texas) and had just changed lanes when the car would not go, I kept pushing the accelerator and the car would not go. Fortunately, I was able to coast off the highway and was able to go up an off ramp and pull off the shoulder of the road. The Mustang started to make a noise and shuttered, so I turned off the engine being afraid that the engine would be damaged. I was able to start the car again and was able to pull into a parking lot and call for help. The engine started to shutter again and the accelerator would not work. Also, luckily a Ford dealership was with a mile so I was able to drive to it and was told it was a stuck throttle body and charged a deductable for a defective part that Ford should have had a recall on a long time ago. I could have been hit from behind while on the busy highway and injured or killed. Also my transmission fills very "jerky" at times when slowing down or after stopping and starting again from a red light or stop sign. I am very glad that my Mustang is still under warranty.