I'd be checking for air leaks on the induction side, check the rubber that connectes the throttle body to the motor, check the fuel filter, have a look in the fuel tank you will be able to see the pump, look for any dirt in the bottom of the tank, the fuel filter is part of the pump, if you see any dirt take the tank off and remove the pump to clean it all out. Take it to a dealer and have the error codes checked in the ECU

one last time...search the forum...there's a 'sticky' that just might help...Im outta here.