At least as far as the engine is concerned, that is -- Volvo is probably your best bet in the USA, to get the old "PRV"[*] V6 serviced. ([*]: "Peugeot-Renault-Volvo", a cooperative project from the early seventies that got this Gang Of Three an upper-scale engine for their respective "luxury" models -- the Volvo 264, the Peugeot 604 and the Renault 30 -- cheaper than if each had built one on their own.)

The running gear might be a bit harder, of course (unless you live in western Europe), but Renault garages should be able to get most of the parts for you -- the DeLorean used pretty much the same bits as the Renault Alpine A310, IIRC. (And thus probably the same as that other French mid-engined V6 coupe', the MVS Venturi.)