My Renault Megane 1998 is accelerated

The car is accelerated to the 3000 revolutions, since the computer activates the automatic primer, when I disconnect the step by step of the computer from the car when the car brake the car is lowered by revolutions and turns off, my question is that it could be. Because I don't want to spend in a new step by step and I see that that is not the problem, the car has gas

Hello, what engine has 1.6 8V if so, look for a sucking air in some side like a hose or by the oling of the injectors can also be in a accelerator position sensor is also damaging that also causes uncontrolled accelerations greetings