I have a 1984 nissan 2.4L 720. Recently reconnected the choke thermostat on the carb after buying it from someone, but now the trucks engine is accelerating and climbing high in rpms with the clutch being pushed in. Can anyone help with any knowledge of this problem. I heard that it could be a vaccum leak or the spark plug wires are not matched proplery?? What could be the problem?

thanks for your help