David - This is most likely caused by the throttle blades being opened a little too much. Sometimes you can turn the idle screw down closing the throttle blades some and then adjust the rich/lean mixture screws to bring the idle back to the desired rpm.
My '86 El Camino (305, electronic Q-Jet) does this from time to time also. It has a solenoid that kicks the idle up to keep it from stalling. You'll see it's plunger touching the throttle linkage on your carb. If like mine, your throttle is set ok on the carb but the solenoid is in need of adjustment. When the solenoid is operating the idle is about 1000rpm when it's not it's about 750rpm.
I'm always tinkering with the Camaros and kinda ignore the El Camino so I haven't done anything more than figure out what the problem is. I found a quick rev and then turning off the key when it settles to an idle usually keeps it from running on. I also notice that it does it more when whipping into a stall, throwing it into park and turning it off as opposed to letting it idle for about 30 seconds after putting it in park... The computers on these 80's cars are not the best!!!
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