Exhaust leaks, cracked manifold, remains of AIR emissions, or aka a "smog pump", or a natural draft air supply to the exhaust manifolds will supply needed air to make one backfire on shut off and deceleration.
Retarded ignition timing, bad vacuum advance, frozen centrifugal advance, will cause higher exhaust temps, and require the throttle idle stop to be too far open to keep it from dying.
Vacuum leaks, Check the PCV hose, see if the underside is sucked in at the barb fitting and leaking.
Try to set the idle as low as practical, and kill it with the clutch as soon as you cut the key. That will keep the engine from pumping raw gas into the exhaust as the engine is coasting down.
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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