a whiring/whining noise coming from underneath on 1993 Ford Explorer

The Noise Just started this morning it occurs when the car is in nuetral or in first with the clutch engaged, I have been having issues with fuel economy, smelling gas, and a low/loping idle speed could this be connected? Helped the fuel economy by using fuel injector cleaner and the highest quality gas and will

Asked by for the 1993 Ford Explorer
could be pilot bearing is dry and or t.o.bearing is going bad