Hey guys, i fixed my knocking problem. I went and got a new vacuum advance and installed it. It was still knocking so I looked at the routing of the vacuum lines and come to find out, the line that was supposed to go to the advance was hooked up to the temp sensor in the air cleaner. I re-routed it and set the timing to where it;s suppsoed to be and it runs like a champ now!!!!!! I do have a question though. My defroster hasn;t worked since I've had the truck. I was looking at the firewall and there is a real tiny and hard vacuum line thats coming out of it and it's not hooked up to anything. Is that why?? if so, where do I hook it up at?? Thanks Ryan Ryan Never knock on DEATH's door. Ring the bell and run...he hates that!!!!