About 2 weeks ago, I did it myself, which I am beginning to regret. When I purchased this Jeep, it had a YF on it, and wasn't running well at all. I changed the intake and rebuilt the WO, and although it runs alot better now, it's still not right. I've checked about all I know to for now. The throttle body shaft doesn't seem too worn, wish I had a good known carb to rule out other issues.