I've got an 88 Ford Thunderbird, 2.3L with turbo, 5 speed transmission. I LOVE this car, except for one tiny annoying problem that is growing worse. If I drive the car for over an hour in warm weather, the engine dies and refuses to restart for 15 to 30 minutes. After restarting, its good for another 15 to 30 minutes of driving, and then we stall again. This used to only happen when the outside temperature was in the 90's, then last summer it started doing it in the 80's and high 70's. This past week it happened and the temperature was only 64 degrees (I had been driving (highway) for about an hour and a half). The point where this problem almost always occurs is when going from highway speeds to a dead stop. This most recent time obeyed that pattern, I was coming down the exit ramp from the highway to a city street.
I've replaced the plugs, plug wires, ignition coil, and distributor cap and rotor and the ignition module on the distributor. I do know that there is spark present, even when the engine won't start. I have nothing to test the fuel pressure with. I do know that when the engine has stalled and won't start and I first turn the ignition "on", the fuel pump comes on for a few seconds like it always does, and then cuts off when it reaches the correct pressure (I assume). Of course, just because it is coming on and I can hear it does not mean that it is actually pumping anything. Is there a simple way to test for the presence or absence of fuel at the engine?