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i just put in a new engine into my mk3, before i removed the old engine it had the same problem, it sat at 2000rpm at idle, i was hopeing that it might be something to do with the headgasget being gone, but the new engine idles at 2000rmp aswell, i seen the engine that i bought running so im happy that its some sensor or something? not directly attached to the engine bcause i got the complete engine bar the throttle body, could it be the lambda sensor on the exhaust? any help is appriciated!!