The turbocharger will rotate at a higher rpm at altitude, compressing the air such that the amount of fuel & air entering the caution chamber is nearly the same as at sea level. From idle to full power will take longer at altitude and it may not be possible to successfully restart such an engine at high altitude until you have descended to an altitude where pressure is favorable to start the engine

The turbocharger will rotate at a higher RPM at altitude, compressing the air such that the amount of fuel & air entering the combustion chamber is nearly the same as at sea level. From idle to full power will take longer at altitude and it may not be possible to successfully restart such an engine at high altitude until you have descended to an altitude where pressure is more favorable to start the engine.