I found out today that my air leak is on the valve stem. Just as I was about to post system showed there were threads about a valve stem seal. I don't know what a valve stem seal is but does it need replaced too? Is changing the valve stem something I could do at home by myself or is it best to take it somewhere?
Thanks!

To change a valve stem you would normally have the tire off the rim to get the rubber piece off on the inside. If you don't care about that rubber piece (full rubber stems) then rip it off and the inside rubber will fall in the tire. Then push a new stem in the hole and fill with air. But if you do that then you will have a piece of rubber boucing inside the tire

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1997 B2300 reg cab 2.3 Lima, 15x8.5 Mickey Thompson classic 2, 31x10.50 cooper discover at3, 7.5 open 4.10 rear, dynomax super turbo catback, alpine iva-w200 w/ nav, kicker 6x8s, alpine type R 8, alpine 250W mono amp, power bass 400.4, tool box & camper shell, compustar alarm/remote start.
1956 Ford F100 rust bucket with big plans!

well a valve stem seal is what makes contact with the rim. What I usually do at work is i break the bead lose on the side of the tire with the valve stem then I push it down with the machine (you could have someone stand on it) and i cut the old valve stem seal off around the edges.. but be careful not to let any little rubber parts go in the tire then when ive cut enough i grab some pliers and pull it out.. then i lube the new valve stem and pull the new one through from the inside of the rim out.. I would recommend you take it to a shop man we do this all the time at work and its not expensive at all.. a tire place should do it no problem. BUT before you do that.. have you checked your Schrader valve to see if thats not whats leaking?? its the little pin thingy that you push in when you bleed air out or fill it up.. they have a little tiny rubber belt around them that wears out sometimes.. you should take the cap off and rub some spit or soapy water on it with your finger if it starts to bubble then the Schrader valve is messed up.. all you do is take screw it off with a schrader valve tool and screw a new one in

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2003 4.0L V6 Ford Ranger Regular cab

Modifications----> 20% side windows, 5%% Tinted rear window and front windsheild strip, , Diamond plated bed extender, Explorer sport Dome Light, Sony headunit, White Face Explorer Gauge Cluster.

Valve stem seals are usually an engine part. Valve stems are the things on your wheel.

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-Alex
'10 Ranger XL 2.3L Manual
Mods: Stereo, Tint, Weatherguard rain shields, Intake silencer removal, LED brake, turn signal, reverse, license plate, and dome lights, DDM HID's (currently removed), lowered, 17" wheels with spacers, Explorer autodim mirror with Autolamps, Magnaflow exhaust, Buggman LED 3rd Brake Light...