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Well, like a 67 bug, rust would be the first thing to look for! While they did come from the factory with undercoating, rust can still be an issue and a sound, straight body is the most important thing; just about everything else can be fixed or replaced. I didn't really remember 300ZX's as being all that great on gas mileage, but that's besides the fact. One of the things I look for is if it looks like it's been worked on by someone who didn't know what he/she was doing, like rigged or sloppy wiring, plugged off or re-routed vacuum lines, etc. If it has electronic suspension, replacement struts/shocks can be very expensive. Many of the parts that are not produced on the aftermarket can be pricey, as well. I've seen a lot of worn front ball joints and tie rods on these vehicles, as well as saggy rear coil springs and bad rear crossmember bushings (polyeurethan are now available). You'll want to know when the last time the timing belts was replaced, or should plan on replacing it if it's not known. You might also want to check to see if the voluntary fuel injection campaign was ever performed; I'm not sure if that campaign is still available, but if it was never done, fuel injector hoses should be carefully checked and replaced, if necessary. Plus, it's never a bad idea to have an auto technician with experience on these vehicles to check it over, even if it cost a little. It could save you thousands!
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