Ok, I'm having trouble finding it in the hayne's manual, where exactly is the air flow meter and how do you check it?

 

The AFM on the GSL-SE is directly under the airbox. If you pull out your air filter and stick a finger down the hole at the bottom you should be able to feel the barn-door style AFM flap.

As for checking it, do a search...

 

I used the ohm meter test to test mine. It's in the 13B section of the manual. It's fairly straight forward.