I had a similar problem with my car. As mine turned out, my alternator wasn't rated to produce enough amps at low rpm. With the big fuel pump and ignition running, the fan kicking-on was just enough to overdraw the system. It ultimately killed the battery and left me stranded a few times before changed alternators. The combo of low alternator rpm and slow wind speed caused my car to get hot and the additional juice needed for the fan dropped the spark needed for the ignition. So it was overheated and stuttering as you describe.
Overheating and stuttering because of the alternator? I know this seems like a stretch but that ended up being my problem. I re-wired the whole car several times trying to chase that down. Lesson learned. It might not be your situation but it's worth mentioning.
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