20 12 classic sylphy changed gearbox oil, engine oil and rear brake pads. After cleaning the throttle, the power is weakened and it is not as light as before.

Say a word or two first, don't feel bad. The repairmen (including those in the 4S shop) are not completely reliable, and most of them are unreliable. I mean their level. Therefore, car owners really need to know something about themselves before they can instruct them to do things.

When talking about vehicles, pay attention to logic, time, symptoms and changes like medical records. There are too many questions to ask, save it. We can only use exclusion. From the simplest lines. Even though you know it is impossible, you must arrange it. 1, check whether the rear wheel is slightly locked, lift the rear wheel, turn the tire to see if it is flexible, and do it yourself. Also check front wheel 2. Check whether the engine oil is added and whether it is genuine. 3. How is the throttle valve cleaned? I wonder if it was removed and washed, but it polluted the air flow sensor and oxygen sensor of the intake branch pipe. After cleaning the throttle, restart the ECU. Did you do it? 4, gasoline grid, air grid you didn't mention, considering the gasoline grid, you can check the oil pressure of the injector first. 5. Does the specification of gearbox oil meet the requirements of the manual?