1998 V70 P0172, rough idle

[evilxsystems]

Hey All-

My 98 V70 had been throwing this code for a while. From looking on this site, I saw that a broken vacuum line can cause this error. I found that the vacuum line coming out of the front of the engine had broken and I patched the leak, this helped for a bit, and I finally got around to replacing the vacuum line after the car started almost stalling, and finally one morning wouldn't start. I got an MAF sensor high code and since the car had 144k miles on it I just replaced the MAF and air filter. The car now starts fine and runs well, but still idles a bit rough and today gave another P0172 code. I noticed that the vacuum? elbow on the back side of the air box looked kinda shot and the vacuum line heading from the vacuum tree down underneath the radiator looks a bit bad as well. Where does this line go? How hard is it to just replace all the vacuum lines? Is this probably the problem or could something else be causing this error? The O2 sensors were replaced at about 75K miles. The car's also got some weird interior electrical issues (dome light doesn't function, warning bell sounds when vanity mirror is opened, or dome light switch is on) from some dumb-shit that broke in and tried to force the ignition but failed.

many thanks
Jason

[mecheng]

The elbow is on the passenger side near the intake manifold. Its hard to see and hard to fix unless you run a new line, I posted my fix