I have a Palio of 1.5. Recently, when driving, the throttle went up and down.

Did you say idling? If the idle speed is unstable and fluctuates, clean the throttle and reset it with a 4S special computer. If it still doesn't work, we must find out which sensor is out of order. Displacement exclusion method can be used. If the warranty period has not yet expired, you can let the maintenance station use the replacement exclusion method. Those sensors are really not cheap. Mainly look at the intake manifold pressure sensor, throttle position sensor and air temperature sensor.