gas pedal is sticking and then it begins to smoke on my 212 Melex golf

@motherhubbard check your accelerator switch. Use a multimeter and check the resistor. I am convinced it is that what causes the smoking. You also want to check the solenoid. A solenoid is nothing but a switch that needs another switch to make it work. ON a cart it is usually the accelerator switch that is connected to the gas pedal. When you press on the pedal the ACC switch closes and this allows power to activate the solenoid. If it gets stuck, your solenoid may just start smoking:-) Post some images of the switch as well as where you think the smoke comes from. Use this guide Adding images to an existing question for that. It will allow us to see what you see and may help to identify the issues