it should be ur high speed is to high turn the throttle down a little first start with the high then with the low. also turn the carb needle towards the front of the car. i mean stand at the rear for the tires look at the carb and turn it forward to open it up if that doesnt work stand at the rear of the tires and turn it towards u. the mgt runs lean and rich but not to lean and rich if u get wat im saying