My car struggles to accelerate going up hills

Really should check for codes, any yellow lights, on, like 'service engine soon' or 'check engine light'? If so, get the codes. It sounds like your power train computer system has a bad sensor, misfire issue etc. How old are your spark plugs, you may have worn out plugs and wires, and the car is misfiring under power as it tries to go uphill.

I Just Had This Problem. And It Was The Catalitic Converter. The Car Would Drive Fine On Flat Ground But Struggle Up A Hill.