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K4M 2004 engine Idle speed oscillating and the car sometimes cut out, something like choking (shaking) when accelerating to second or third gear, the problem was maintenance on the actuator, but it could also be a lambda probe, coil or injector nozzle in my case it was the idle actuator, maybe it works for other cars like Symbol Sandero Megane Logan 1.0 2.0, 8 or 16 valves, maybe Peugeot and Citroen. other cars with Fiat Chevrolet VW Ford may possibly be different, I hope I helped Sensors sensor rotation actuator idle stepper motor car dying choking idle low high too much