2003 Mazda 6i with 82k on the clock. I've noticed a sound that only happens when the engine car is cold. It sounds like a rubber creeking for a second when I go off or on throttle. After 5 minutes of driving, I no longer hear it. It's almost as if rubber bushings somewhere are making a creeking noise (Motor or Tranny Mounts?). Could this be the case? Have you guys heard this happen?