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Just helped a friend with this. It may be your Throttle Position Sensor, it may not be plugged in or faulty or set incorrectly.
It also could be one or more of your injectors took a shit. You would need to remove the harness plugs that plugs into each injector, and use a Multimeter to check the injectors to see if they are 11 ohms (which is good) and 0 ohms is bad injectors.
Surbaru = Bad injector(s) or Maf
Jerking = TPS
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