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When I was driving to work the other day, I accelerated briskly (but not really fast) into traffic on a busy road. While I was doing this, the transmission and/or engine revved way up - far more that I would expect. Then it stepped up faster, and then stepped up ever faster despite the fact that I backed off on the accelerator. After the engine slowed back down, the car was running very rough, as if one cylinder was not operating. The "Service Engine Light" was flashing. I pulled the car out of traffic and shut it off. After it was restarted, it ran fine. I took it to the dealer yesterday. The car did record an error code for the malfunction (a cylinder not working), but the dealer didn't seem sure what to do about it. We're waiting to see if it happens again. I don't know if the revvig engine/transmission problem is related to the cylinder issue. That seemed to prompt the cylinder issue. I don't think they pulled up any error codes related to the revving. Anyone else have such a problem with their C-Max? That's only happened once in the 2 months I've had the car.