Operation problem

I have a problem with my running year 91, 1.600cc engine. 4th.
When leaving between 30 and 40 kilometers per hour the engine works irregularly giving jaloneos as if the ignition or injection was cut. The engine does not go out and if the fixed accelerator pedal is maintained in the position in which it fails, the jaloneos are maintained.

Hi, you will see how the accelerator cable would start by disconnecting that you may have to decarbonize the butterfly body. GREETINGS