backfire can be caused by choke not shutting off completely, also could have a bad distributor cap, bad spark plugs, bad ignition condensor, bad plug leads, or to much fuel getting to carburetor system Consider getting yourself a service manual as it contains many troubleshooting for your car.
Median age* of the population. Over the past 50 years, the median age of the world's population has increased by a mere three years, from 23.6 in 1950 to 26.4 in 2000. (The median marks the point where half the population is older than that age and half is younger). But over the next 50 years, the median age will jump to 37, according to the latest projections made by the United Nations. By 2050, 17 developed countries are expected to have a median age of 50 or more.
In the city the age distribution of the population shows 29.8% under the age of 18, 8.6% from 18 to 24, 28.3% from 25 to 44, 22.2% from 45 to 64, and 11.1% who were 65 years of age or older. The median age was 35 years.