Help w/ Diagnostic
 

I have a 02 nissan altima 3.5. I just recently started having issues when I stomp on the gas pedal (not necessarily stomp but give it some gas) my car flutters like the fuel injection isn't working and then my car stalls. I recently had an issue like this and the dealership performed warranty work and also replaced all of my belts (costly). The same thing was happening prior to this. I can't think of anything else that might be causing my car to have these issues. Any thoughts?