Your car’s struggle at high altitudes could indeed be due to an fuel injector problem. The fuel-air mixture in your engine needs to be just right for optimal performance and this balance can be thrown off at high altitudes due to lower oxygen levels. Faulty injectors might fail to adjust the fuel supply accordingly, leading to poor performance.
However, other factors could also contribute to these issues, such as a clogged air filter or issues with the oxygen sensor. I’d recommend getting your car checked by a professional to pinpoint the exact cause.
Safe travels, Jane!