Car starts then stalls, have to keep foot on gas

How would I reset the air rate?

As far as your supercharger goes it is highly unlikely that it is on its way out or anywhere else for that matter, particularly if it has already been replaced once. They rarely fail because there is really nothing going on in there other than a couple of bearings spinning around in synthetic oil in a sealed system. Lots of superchargers get replaced because the coupler goes and makes noise and those not in the know decide its the supercharger at fault. While they're at it they replace the coupler as well so the noise goes away and they think they've done the right thing. Of course lubricating it with something other than the factory recommended synthetic oil could cause a failure if the replacement oil is inferior to the factory lubricant. If you read your owners manual you will discover there is no maintenance schedule for the supercharger other than checking the oil level. It is basically a maintenance free device which is one of the reasons superchargers are so awesome.