When ascending, a spiral light turns on and the engine loses power considerably. After some minutes, the car suddenly recovers but fails again a while later. Occasionally, the pump light indicator turns on as well. What can I do?
From my experience, I recommend you to change the oxygen or lambda sensor and the spiral light will disappear. You should first check that none of the light bulbs is blown. If they are all alright, change the brake valve located in the brake pedal. Hope my suggestions help you solve your problems.