[Im Lon 2]

I have been having an issue with the car surging at 55-60 MPH when I would let off the Gas. Yesterday it started doing it at any speed and the check engine light finally came on so I could test out the Codes. The code came up as P0102. But when the guy was testing it he said it sounds like a vacuum leak. Last night we took apart the Air Filter box, and the boot that connects the filter box to the Throttle body. The Sounds sounds like it is coming from the Throttle body itself. I have checked all the air lines and cannot find anything wrong with any of them. Does anyone know what this noise could be caused by? Maybe one hose is clogged?
Also have 2 other questions regarding Sensors. there are 2 sensors I'm not sure of... 1 is on the boot that connects the Air filter to the throttle body. And 1 on the throttle body.. What are these 2 sensors called. one I'm guessing is the MAF but not really sure.

Any Suggestion would be appreciated
Lonnie