I know this isn't the exact same car as on the thread title, but it's the closest thread to my problem.
I have a 98 lumina ltz with almost 150k mi, and a history of a delay in initiation of the starting cycle; when you turn the key, there is sometimes a brief hesitiation before the engine cranks. At various times, I have replaced the plugs, wires, the starter, alternator, and a few batteries. It also has this oddity that i think is unrelated, of not lighting up any brake lights except the highmount unless you pull back slightly on the turn signal.
A few days ago, when starting it up in the am, it hesitated briefly before cranking, then had an unusual rough idle that persisited until I shut it off. The next time i started it up, the hesitation was slightly longer, and the rough idle was present again. Also that time, the security light stayed on. After filling it up at the gas station with it running because i was afraid it wouldn't start back up if i turned it off, i proceeded down the highway. While on the highway, at approx 50mph on a slightly downhill slope, the engine misfired, and a second later stalled out entirely. While coasting in neutral, I tried to start it again, and at first there was no response, but after a few tries it would crank but not start. After getting it towed home, I discovered a blown serpentine belt. After replacing that, there was no change. The car still would crank but not start. First I checked all relevant fuses and relays. The fuel pump relay is heard to engage, as well as the fuel pump itself. Fuel is getting to the fuel rail. An ignition tester at the plug revealed no spark is being produced. It also appears there is also no current getting to the fuel injectors, as there was no reading on a voltmeter in the electrical connector off the fuel rail. My guess right now is the PCM. Anyone know where it's at, or have any other suggestions?