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If the engine speed fluctuates at idle, then you can quickly check whether the DMRV is the problem or not without instruments. I installed a faulty DMRV in order to show how the engine works with it. I clearly show on the faulty sensor how to check the DMRV. A sign that the mass air flow sensor is faulty is unstable idle speed, sluggish acceleration of the car, increased fuel consumption. #dmrv #how to checkdmrv