Possible vacuum leak
 

Ok hope you guys can help me every time I get on the gas/ accelerate the ac goes from max ac to the defrost what is the best way to fix this / find the problem

Look for a small black vacuum line on the firewall RH side, it will follow firewall and should route to the inner fender, coming to rest at the vacuum reservoir which is in between the battery box and the inner fender. More than likely your line is cracked or broken. Keep us posted

Ok I found the problem the line had a bad soft coupler a pice of vacuum line fixed it thanks for the help