I have had the same problem on my '00 Mystique and have not been able to find any cause yet. The level of gas in the tank does not seem to be a prequalifier (happenes at all levels) but it seems to happen after taking a turn and then quickly accelerating. It almost seems as though the engine will stall but it doesn't and then the power kicks back in. If you have had any luck at a shop or found the answer to the problem I would be interested to hear about it. Good Luck
