I sometimes read about people asking advice how to find a vacuum leak. Almost always a common recommendation is to spray something flammable around the engine area that's suspected, and see if engine speed changes. I can't imagine that method working unless the leak is huge. Besides, I really really am cautious about creating a zone of flammable vapors and fumes around hot and possibly spark-inducing machinery. I stumbled across a few helpful hints for finding leaks the safe way that is far more effective than hoping the engine changes speeds. SOOO..... Here is a cheap device I made from spare junk laying around my used parts bins. A jelly jar, a soldering iron, some baby oil, and a little epoxy. Thats a wad of fiberglass cloth you see inside the jar to act as a wick to keep the soldering iron wet with baby oil. Voila le smoke generator. I blew smoke into the intake, or you could blow into the brake booster hose, and easily saw smoke signals coming from three hidden hose leaks that were making the engine idle rough. I found other ideas on Youtube. It made me wonder why it took me so long to actually do it. I think it cost about $5 Just plug in the soldering iron, wait a minute or two for the smoke, plug almost any of the car vac lines to the jar, then blow on the other hose. Any well hidden vac leak will send smoke signals that are easy to spot. ...and you won't get a fireball from spraying too close to something... Oh yeah - P.S. That tape you see where the wire enters the soldering iron is to seal up a smoke leak when I blow into the system. I put rtv gasket sealer around the cord, then taped it so it wouldnt leak smoke when I blew in the hose WHY BE ORDINARY ?