[ChevLoRay]

In the mid-70's, dieseling was common. Lower compression ratios; timing issues and the change from leaded to unleaded gasoline all contributed to the issue. Manufacturers attacked the problem by installing fuel shut-off solenoids that were nothing more than a way to positively close off the throttle.

The industry name was Ignition Run-On. This meant that the engine ran on after you shut off the ignition. But it is a combination of things that cause it. Fuel entering the combustion air stream, which is then sucked into a hot combution chamber is what it is. Shut off the fuel. Shut off the air. Alter the timing if it isn't correct.

One old school way to stop it is to simply drop the shifter (automatic) into drive after you turn off the key, or turn it off while it's still "in gear". If it's a manual, just hold your foot on the brake, and let the clutch out while it's still in gear....come on, you've never killed a stick shift by dumping the clutch?