I just purchased my z 3 weeks ago. I want to do a lot of work to it but of course time and money will tell how far I get. My biggest problem right now is getting it to idle just right. I have replaced all the rubber hose on the fuel lines, plugs, timing, new fuel filter, air filter, all vacume lines check out. but she still wants to rev very high when I first fire it up and it will not drop down until I accelerate past 3200rpm. then as it is sitting the idle will fall off, just a bit but enough for it to anoy me. I also have a loud clunk in the rear end when I jump on it. so needless to say I have been babying it, if anyone has a suggestion I would be greatful, I don't know to much about inline 6's . YET.