Well first off I will start buy saying I searched and cannot find a clear answer. The car surges badly when the ac or the heat is on. It is fine if they are turned off. The ac is not working and does not even cycle on when it is turned on. Is the ac compresser the cause of these problems? Does it need replaced or have nothing to do with the problems? I thought maybe a leak but no luck in finding one. I have done plugs,wires,cleaned maf,cleaned iac, no luck.