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Constant jerking under boost

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Greetings. Please can you guide me.

My 2002 Impreza jerks as soon as boost kicks in. Ej20 with a TD05.

New plugs fitted + We have changed (all OEM). MAF sensor, Lambda sensor, wiring harness, coil packs, replaced the CAI with the stock air bock, cam sensor.

We even put the stock turbo back.

Issue persists.

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