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Have you analyzed the o2 and mass air flow sensors? My 93' 600sel has the same problem and when analyzed by the dealer I was told it was more than likely the mass air flow sensor, or O2 sensors, or throttle motors. I replaced the O2 sensors first with little success. Then I replaced the mass air flow sensor on the passenger side which helped a great deal but not entirely. When the budget allows I'm replacing the drivers side mass air flow sensor. I hope that does it, because the dealer price on the throttle motors is about $7,000. If they need replacing.....the car will become a parts vehicle. When the car balks like you describe, turn off the cruise-put it in neutral, and restart it. It should run correctly for a while to get you out of trouble on the road. Happened to me during rush hour on the I-system in downtown St. Louis......scary!

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