Steering Problems..Rpms drop..Hard to Turn..?

This has been happening since i owned the car. 95 4.6 tbird, 128K miles, full power steering etc.

Hot or cold, when i get in my car, and turn the steering wheel either at a stop, or going really slow, like 2mph (parking lot spot exit/entry etc) the steering is pretty hard to turn, AND the rpm's drop past 500rpms.. The voltage gage drops alittle also-just enough to make my headlights dim. This ONLY happens for like 1 second...but it's always there..? What gives..?

I checked all lines, nothing is constricted..all components seem fine, every thing greased properly etc. Fluids are fine also. Funny cause yesterday i went and bought a rubberized steering wheel cover-to give me more grip, and turn the wheel much easier.

I'm concerned because i've driven other tbirds, well..my bro's 91, and his steering is VERY loose/easy to turn at low speeds..whereas mine isn't. Honestly, it feels like a Front wheel drive car the way it steers at low speeds..past 10mph the steering is fine, nice and loose. One thing i must note, this seams to be like this ever since my MAF sensor went bad..for like 2 weeks, i had to up my idle to like 900 vs. normal 750 (so my car wouldn't stall at a light).. I put the new maf in, same model for my car...adjusted my idle back down to its normal 750 at idle...NOW THIS...

Underdrive pulleys can cause this as well as a bad pump or bad rack & pinion, though a bad rack & pinion is usually noticed at any speed/condition in specific areas of a turn. Meaning it will happen when the steering wheel is turned into or through, as an example, the 10 - 11 o'clock position.