Car Hesitation 1900-2200 RPM (3/4 Gear)

Hi

Over the past month, my car has been hesitating in 3/4 gear right around the 1900-2200 RPM range. The tach moves up and down (like a rev limiter) between that RPM range for a few seconds then it is okay. I notice it mostly when I get on the expressway. The car has 185000 miles and here is a list of things that I have replaced along with the mileage that I think might possibly be the issue:

Mass Air Sensor -163000
Tune up - 160000 (Plugs + Wires)
Fuel Filter - 145000

I checked through the forums and didn't see my particular issue. Thoughts on the issue?

2001 Pontiac Grand Prix GT, 3/8L non supercharged.

Thanks!

Sure that is not your TCC solenoid, kicking in and out?

I cleaned out the Mass Air Flow sensor and that seemed to have corrected the issue. Maybe a throttle bottle cleaning wouldn't hurt either.