1990 Reatta, 155K miles, owned two years, occasionally hard to start, may take 10-15 seconds to start, other times fires right up. Put pressure gauge on fuel rail, about 40 PSI for 2 seconds, then drops to zero quickly. (Fuel pump runs for 2 seconds when key turned to 'on', then shuts off-as it should-but pressure should hold). When motor is running has good fuel pressure. So, losing pressure in fuel delivery system. Could be stuck injector, bad fuel regulator, failing fuel pump, bad check valve, leaking lines inside or outside the tank, maybe a couple other things I'm not aware of. Clue--car frequently has a rough idle, made me suspect a stuck injector. I didn't want to try to figure which injector(s) might be sticking. I had half a bottle of Gum Out fuel injector cleaner, never had much luck with these types of 'cures', but I tried it. Can you believe it--it worked, or at least whatever was causing the pressure drop is gone, and the idle seems better. Occasionally I get lucky!!!