I have a 2012 nissan altima. I have ran into this problem 3 times within 1 1/2 months. All times while entering the freeway. My car jerks and will not go pass 20 mph and rpm will not go pass 2 and half. When I pull over and put it in park rev the car then turn off after the third time it fixes itself. Can anyone let me know what can be going on.