stupid idler arm

:banghead:I've had 3 new idler arms on my scamp and it's the same thing, as soon as I drive it the driver side wheel will be straight and the passenger side will be turned to the right a bit, get back home and jack the car up and move the wheel by hand and the idler arm jumps up and down, the mounting holes are in good shape the bolt is a snug fit, the arm just slides up and down the sleeve. any ideals on how to fix it? thanks in advance.