You can check for vac leaks with brake kleen or carb cleaner. I would suggestI heard a good way to check for vacuum leaks is to create one on purpose, meaning remove a hose from a known vacuum source. If engine speed rises, you have a leak somewhere. If engine speed drops or cars tries to stall, then there are no vacuum leaks.
It weird but an easy and effective way to tell for sure.
you do it with engine cold just for safty reasons. I perfer a hand held propane bottle, works best with a little hose extension, its very effective.. your idle may go up or down but you will know when you hit the spot. lol