I've had this car sitting for ages, and finally decided it was time to do something with it. It's been sitting for a year or so, but before it had been sitting it ran fine for a little while. About a week or so i'd say after I got it? Got it with 79,000 miles on it, everything original. I ran it for about a week, no problems at all, then one day I started it ran fine until it hit normal running temp then shut off, wouldn't start back up. Let it sit and cool for a bit, did the same thing, ran for a bit then died. I put it in the shop, didn't feel like messing with it, they said they fixed it, ran fine for a week and then did the same thing.

I haven't touched it since then, would anyone have any idea what could and/or is causing this? It's a 1979 280zx, non-turbo.