David C. Moller did pass the time by typing:

Yep.  If it finds a leak your engine will stumble and almost die.
Same effect you get from spraying it down the intake.  I use that
trick for finding all sorts of vac leaks, even hoses and fittings.

Do be careful with using it on form-in-place gaskets.  For the most
part RTV is immune but some gasket materials will dissolve with the
cleaner.  (it's what I use to remove gasket material) :)  But it's
safe around paper and metal/carbon gaskets.

Some folks also use propane/butane and a long hose.  It makes the mix
richer and increases engine RPM. Actually it's cheaper than TB cleaner
and not nearly as messy.  Just take a few fittings to adapt your propane
torch to a long bit of rubber hose.  I'm out of mapp gas so the TB cleaner
was next in line.

Here is another trick that I learned from a crusty ol' wrencher.

Take a vacuum cleaner and connect it to the intake, you don't want
a perfect seal since it just laggs the vac cleaner.  Now prop the intake
open and use a ciggy or smoke source to hunt for leaks.  If it goes in
you found a leak.  Same applies for the exhaust system.  Stick the vac
in the tailpipe then hunt for leaks in the plumbing.