Let the car run for a few minutes at normal idle. Then turn off engine and re install the air filter and housing. Now drive the car for 10 to 15 minutes or until hot ,allowing the carb cleaner to completely run through the system. Even if you don't feel any increase in performance, you can rest assured that you are doing all you can to care for and preserve the carburetor. In some cases, if the carb was dirty with carbon buildups, you will feel increased power and save fuel at the same time.