When speeding the speed limit wouldn't exceed 80km. Pls how do I reset it

I have an epicа 2009 lt when the engine starts the car starts shaking and the rpm drops to 500 after 10 seconds it rises and recovers

When driving at a certain speed with my Epica 2007 and it is accelerated, the vehicle suddenly loses control of the acceleration, maintains 1000 rpm, it blocks itself and the yellow engine alarm appea… 

My speed omiter won't come on the first 8 or 9 miles and my check ingine light comes on when the car goes for a bit the speed omiter kicks on and the light goes off what's the problem

Speed ometer stopped working

When crossing a speed hump or any oher obstacle, the engine stalls.