Hello, My sister owns a KIA and it runs great but it loses power when climbing a hill. What will cause this?
Engine too small for vehicle weight, fault in the ignition system or perhaps it needs new plugs and wires.
You’ve not given us enough info to help properly.
Vehicle make (Kia), model, year engine size, mileage, and exactly what happens when going uphill? Engine just dies? starts to miss?
When was the last tune up? Oil change, etc.