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Well pumping the pedal on a fuel injected car does nothing. If there are no trouble codes stored in the computer, look for excessive fuel from the injectors or the fuel pressure regulator. Or lack of air thru the idle air control valve.
if code keeps coming up re check sensor and connections and if not done replace air filter ----if good than check fuel prssure sometimes clodding fuel filter can cause same problem and set off sensor
sounds like a large vacuum leak to me possibly a bad mass airflow sensor but i would pinch off vacuum lines maybe spray a little carb spray around throttle body and intake area to try and locate any vacuum leaks
Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.
it almost sounds like a fouled fuel injector. this is a tricky problem because it involve so many different operations. the maf is used to deliver fuel and the o2 sensor tells how much. there are 2 o2 sensors one before cat 1 after. mabey check these out visually. the computer should pick these sensors up if there bad. is this a supercharged engine? ill try to come up with some other ideas for you soon.
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