My name is Devon, and I have a 2001 Ford Mustang Cobra convertible. Since yesterday I've had problems with the gears shifting when the engine is on. When I start the car, in neutral, I cannot engage any of the gears even though the clutch is to the floor. Then later yesterday the problem went away entirely and the gears shifted fine. Again today it worked this morning but started acting up again this afternoon and now I have the same problem. It's fine if I start the car with the clutch in and in first gear; then I can drive it in first no problem. So it does not appear to be a problem with the clutch itself (which is only 2 years old). It is also worth mentioning that the weather here has been really bizarrely unstable the last couple days with the humidity levels and air pressure constantly changing. So I wonder if that is tripping out the car's computer and creating bubbles in the transmission fluid.