A few months ago our car was acting weird. Every time we'd try to gain speed it would jerk and the rpm's would go up and down like crazy. We figured out we needed transmission fluid and it solved the problem. Now the same thing is happening, except we've put in transmission fluid and its not hemming this time. We've already had a new transmission put in the car. So not sure what it could be.
And once in a while when we try to accelerate, the engine light will blink on and off for about 10 seconds and then stop. I looked on Google and it said it could be the catalytic converter. What does it sound Like?