Thanks Colin, your logic matches mine. My DeLorean had this problem, except it would not start when hot, after 30 seconds or an hour. It was the fuel accumulator leaking down. I replaced it and cured the problem. However, I don't think my car has an accumulator. It has two fuel-pumps, each with a check-valve. Maybe one of these is bad. I guess the first step will be to hook up a pressure guage to the rail port and see if the pressure is bleeding off. I also suspected one injector, but pulling all the plugs revealed no sign of one burning rich. I'll post my progress.