If you have the ADD system, it could be a vacuum leak. My advice is to ditch the ADD, and throw on a set of manual hubs. Less wear on the front end, more MPG, and less to go wrong with the ADD crap. Just my 2cents.


93 4runner V6, 4.88's, 31" mt's with more to come.
03 Tundra V8 on 265's