You should have a small bank of Fuses under the rear seat on the drivers side, access is via a flap in the upright where your shins would be if you were sat on the seat, there are about 6 fuses...
Most common problem and easiest to fix is a dirty mass air flow sensor. Go to an automotive parts store and locate a can of Mass air flow sensor cleaner (it will be in an aerosol can). Do NOT use...