Need a vacuum line schematic for a 99 buick 3.1L engine

SOURCE: What is the vacuum line schematic on a 1996 buick

vacume diagram should be in cow section under your hood spray brake cleaner avoiding exaust will change rpm allowing you to locate if it is a vacume leak if 3.8 or 3.1 check the crank sensor with a multimeter. book will tell you how but can cuse a miss if bad or harmonic balancer has damaged

SOURCE: need vacuum line diagram for

try this website: http://members.dandy.net/~k0xp/Oldsmobile/OldsDiagrams.htm
it's based off of the 1984 cutlass with 307 but may work on other oldsmobile buick and even cadillac vehicles with 307. hope this helps.