Brief intermittent vibration noise when going up incline at 38-40 MPH on 2001 Acura TL

No noise under or over that range. Car has 128,000 mi. Other then that, runs fine

Asked by for the 2001 Acura TL
poss motor mount issue
Is this an expensive repair (providing that's what it is)?
can be around 200 to 400 depending on which mounts