Yup, carbs....Jeeps had 'high altitude carb kits' back in the day. Fuel injection changed the need for that unless it's manually controlled.Just suggested something else for the prep list.
Used to tune my carborated cars. I get it.
Polaris ATVs we had a high altitude adjustment to be made in their transmissions. Why? I dunno, but it was. Faster lockup maybe?