Doesn't want to shift to second gear

My vehicle is missing at around 55 mph. I changed the spark plugs,wires, and even the coil pack.

Getting around the code 16 theft...need help

On take off shudders for 1-2 seconds then it's fine

While driving the car shudders or vibrates very violently especially when the gear is shifting and the RPM is around 60 -80 mph

When going to speed up around a corner or a turn, the engine will shudder and the acceleration is delayed by a few seconds.