When i drive and coast at 20mph or faster, i hear an oscilating rubbing noise on the passenger side. Seems to be by the firewall, or the right tire. I can also feel it on the gas pedal.
What could be the cause of this?

 

could be your belts rubbing on a foreign object or possibly could be your wheel bearing. I would lean toward your wheel bearing if you can feel it in your accel pedal. good luck.

 

A few possibilities.

-Bearing
-CV joint
-Brakes not releasing all the way... but that would give a definite pull.

I'd say myself that it's the bearings.

 

i'd say most likely the wheel bearings