2003 ford f250 has issues accelerating, ok on flat, won't hold speed on hills

Any warning lights lit on dash? And does the engine lose rpm's uphill or keep the same and still not hold speed...as in transmission slipping? idk if you even have an auto trans

No warning lights no codes starts and runs ok, just no power or acceleration ok power at start from stop but once I am moving no power when I press accelerator will go. 60 mph but no power to accel also do not hear turbo when accel