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the EGR is VERY important to the computer. it constantly gives info to the computer about just how the engine is running, which in turn controls spark advance and fuel delivery.fix that EGR and at least it'll run a little better until you can fix that hose at your vacuum canister.
P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance I suspect the EGR got stuck closed, u will need to put around 30 miles on the car before the light will return if the problem is still present..