RPM Excelerates on 2006 Ford Taurus

When driving the RPM will increase 200 to 500 RPM, the car does not accelerate, feels sluggish and then within seconds returns to normal operation. This happens only once in a while and there are no problems with shifting as I accelerate from a stop.

Asked by for the 2006 Ford Taurus
This sounds like you need an Automatic Transmission Diagnosis. This can be called and intermittent flared shift, or 'flare up' that is not even during a shift.