Can not kill LA......Running on

[MoparJoe20]

This is sending me mad. When hot & driven for some miles I go to shut it down & it runs on wheeze then blows smoke out the air cleaner.

The 318 has done 70,000 miles for new since 73, has no blow by, no oil usage, has no knocks & sounds good.
Its not hard to start hot or cold, have replaced the spark plugs with colder ones, set timing at 7%, has new leads, cap & rotor.
Have also rebuilt the carter carb.

It is fitted with Dodge electronic ignition.

What else can I try as its embarrassing & pepole keep asking if I need a firer extinguish.

Unmetered air causes run-on, you can crank the timing back to stop it but that hurts performance. Try closing the throttle blades as far as they will go without the engine stalling and see if it still runs on, if it still does afterward look at the carb gasket, open vac ports or cracked hoses and check the vacuum tree at the rear of the manifold where the power brakes etc hook up.

You can try disconnecting the throttle cable to make sure it isn't holding the throttle blades slightly open also.

 

[archlab]

Unmetered air causes run-on....

That statement just makes me wanna rip my carb off & go snag a Fuel Injection System....