vacuum leak

So my 2004 Buick Lesabre (3800 S2) was running rough when it got warm. I found the cap was missing from the little vertical tube that comes up from the brake vacuum hose. On mine it just has a cap. Well, the cap was laying off to the side. I've put it back on a couple of times. I think it was...

So I've got a 1994 Roadmaster Wagon which has been acting up in the last few weeks. I'm not sure if it's a misfire or what. A few months ago (about 10k miles ago) it was also having a pretty severe misfire. I took it to a mechanic who replaced the distributor and the spark plugs. After he did...

It has a new battery, plugs, wires, and both the fuel pressure regulator and starter were replaced within the last year. I tested the battery and it's solidly at 12.6 v. AutoZone and O'Reilly both tested the battery and alternator, and they say everything looks good. I took it to the...

does anyone know where i can find the vacuum lines to get rid of this code?

Background - passed away in-laws car, sat up a lot, low miles and now daughter drives to high school. About 4 years ago, best shop in town replaced fuel pump for $750 - only uses new GM factory parts. One morning, my daughter said she was so low on gas and did not have time to get gas before...