I have had this problem for the past couple of months with a 1994, 3.8 Mercury Sable. From time to time, after sitting hot for some time the car is hard to start. It will start eventually, but takes several cranks. It happens usually when weather is hot. Two days ago I gave up and went to the dealer, they replaced the idle control valve, 300 bucks and today I could not start it again. It was around 20C/68F. The idle is a bit rough, tacho neeedle mover up and down a bit. Fuel pump comes on, fuel pressure seems OK, new spark plugs, wires, fuel filter. Until now, there was never starting problem. It starts OK when cold. I am stumped and the dealer has no idea what to do except wanting to replace more stuff at random. No codes in the computer, by the way. Rides well, no stalling or lack of power when running.
Stan