Mitsubishi Repair: low power when A/C is on, electronic fuel injection, moderate hills

Question
My car is a Mirage 97, automatic, electronic fuel injection. When I don't use the A/C, the motor provides enough power for good acceleration and to climb moderate hills at good speed.
When the A/C is engaged, the motor loose too much power. I replaced the air filter, gasoline filter, sparks. Any suggestion on what to look for?


Answer
Justo: I would look for a vaccum leak. You should try to get a repair manual for your car. It will have a trouble shooting page or pages; they will explain what you should look for. Haynes is a good one to get and it will cost about $20.00. Hope this helps and good luck!