I've used spray-can carb cleaner to check for vacuum leaks this way... that
may be a bit safer than propane. Opinions?

>Also, if you ever use a propanetorch to check for vacuum leaks, air out
>the area  being checked every fewseconds(as opposed to minutes). Be
>careful using it near the altenator ,sparkplugs, and distributor, as there
>are sparks present in these areas