ok, I had a similar problem. Follow along and see if this sounds like it. When it first started to act up, it would crank fine in the morning, then after about a 5 min drive it would stall. It would not recrank until it sat for about 30 to 45 mins. As it got worse it would have to set for several hours or overnight. At first it acted like a spark problem, so I replaced the coils, coil control unit, ignition switch, plugs and wires and it would still do it.
As the problem got worse it got to thinking about what actually controls the fuel and delivery systems. The ECU (computer) controls the spark through the coil control units and the fuel delivery through the injectors and pump, but the 'crankshaft position sensor' is what tells the computer what to do and when to do it. I am not sure if that is what HMC calls it, but it should be located on the lower back of the motor, look for a shotgun shell sized tube sticking out with one or two wires. I am willing to bet this is your problem. As the engine warms, the contacts will start to seperate, and the signal going to the computer falters, causeing the starting-running problem. Oh, they are pretty cheap too, for my wifes saturn is was 11.97
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