CRC makes a MAF cleaner. Autozone or Oreillys should have it. If not they will have something similar. Either that or electronics parts cleaner for PC's and stuff would work.
Since I assume your car is not supercharged, I would say check the large vac. fitting that connects to the UIM at the back of the motor. It is a large connection w/ 2 lines coming to it. Other places include MAP/PCV area, UIM itself (around the edge where it seals to the LIM), throttle body area.
Just spray some carb/brake cleaner around all the places that could be vac leaks while the motor is running and see if you hit a spot that makes the tone/speed of the motor change. If so, then you found a leak.
