Loss of power with the A/C on

Greetings ...... My Honda Civic 1995 Motor 1.6 äl Moment of starting from a stop with the A/C on, loses almost all the power and takes a long time to move ... If I stop in a steep slope, nothing progresses ....... with the off -cut are working normal .... I already changed välvula îac, bujas cabling FIFTH. The computer does not reflect errors codes. Thank you for your help