My 2006 Audi A4 has a hard time accelerating unless you press the gas pedal a lot. When I turn the…

My 2006 Audi A4 has a hard time accelerating unless you press the gas pedal a lot. When I turn the key in the ignition, it sometimes has a violent start when the engine making noise and vibrating. It calms down once you start driving though. I replaced the fuel filter. The check engine light is on. Please help.

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