Gas Pedal

:uhoh: My 98 bonneville Sse gas pedal feels weak. I almost feel that it has no pressure what so ever and its not extented all the way. Greanted the car has 98k i assumed the pedal would had weakin some but not to this extent(i bought used at 93k). My battery gauge reads lower than the middle too.I recently had 4 new 4ohm speakers instaled, with a pioneer premere 50x4 22rms cd deck witch replaced me Bose system. And addition i connected a 1200 watt amp and sub. This problem didn't exsit before all this but i didn't start tell 3 days after. I play the amp sparingly so help:eek: