Good afternoon, I drive a Mitsubishi Colt built in 1998, 220000km. The vehicle has not been moving for a few weeks. If I go up the mountain or so I have to scare it off. Bringing it to the workshop brings nothing because they certainly don’t find faults and collect a lot of money. It feels like there’s a slip, the performance falls off. what could that be? can someone help me? Thanks. LG