My car had to have the distributor replaced and i did it and it starts right up so no problems there ya for me. Now the cap and rotor replaced at the same time wires are good the problem is my car surges when the air conditioning isn't on. when the air is on or defrost the engine purs like a kitten but when i take it off it surges. The only thing i need to replace is my muffler that would do that right? I also just cleaned my idle motor i am thinking vacum leak any suggestions?