Chevrolet Corsa Wind 1994

Dear friends, if someone could pass me the Chevrolet Corsa Wind 1994 manual, I would appreciate it very much. I moved to a city that is at 2500 meters above sea level and the car is drowning in the morning, it seems to me that it has to do with the empty sensor, I change spark plugs, I put it ready and the same thing happens.

I thank you for the help that you can give me