Idling high especially when warmed up.

[Monty123]

I have a 2001 RT10 that is idling high when it’s warmed up and takes a little longer to go down to normal idle RPMs. Suspect a vacuum leak. Is the smoke test the best way to find the leak and what is the best place (places) to inject the smoke, vacuum lines, intake manifold? Do I need to worry about the MAF sensor?