Ruff running where is a vacuum hose located on a 1999 chevy blazer?

Hook up a fuel pressure gauge an see if you are not loosing fuel pressure causing this running problem. Hook it up to the fuel rail with a long enough hose to locate the gauge where you can watch it while you are driving. If you are loosing pressure then check for fuel resistance in the line, fuel pressure regulator or fuel pump going bad.

in between the inner and outer fender just underneath the left side hood hinge ... dig deep, youll find it

There is a diagram under the hood on the emissions system sticker.

your running rich, plugs are fouled now. can be many causes. Large vacuum leak. Bad fuel pump. Bad oxygen sensor or circuit. Bad PCM, Bad altitude sensor(MAF sensor) . make sure the pressure regulator on the fuel rail is plugged in.

Best bet is to get it diagnosed if you cant find anything unhooked.

There are a bunch of vacumm hoses on every engine these days. They
are black rubber or plastic hoses, that are roughly about a quarter inch
in diameter. They are routed off the upper section of engine,usually
going into the back of the firewall to the HVAC controls in the dash.
Heat will eventually crack or break them completely.Good luck.

look on google i can fing everything there if you want email me with your emailaddres i will try to find it for you

under the battery is where you need to check first,then follow it down around the right front wheel well,

it kinda hard to get to but its located on the left side if you stand in frt of truck,its way down the bottom, i would just pull lower hose and drain but good luck hope this helps.

99 chev blazer should have an electric motor not a vac switch...Is your controll on the dash a switch you turn.. or on the floor you shift ??

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.