Another Problem...when will it end!

I got my braking problem fixed,the one where the caliper was locked and pulled to the left side,it was a brake line hose that caused that one.
NOW..when i put the wheel back on i noticed that i could wobble the wheel side to side,had a freind tell me it's the Idler arm,this truck only has 42000 miles on it and i bought it new in 1991...should i be having these types of problems at this mileage?
If indeed it is the Idler Arm..how do i replace it?
My truck is a 1991 Silverado 2WD.
Thanks for all the suggestions!

on the 90 and 91 2wd trucks, this was an issue. They are nice trucks, but from my experience with them, if you want the problems to end, buy a horse.
These were somewhat transitional years for chevy trucks, and there were a lot of problems.

Alternators failing repeatedly due to bearings, idler arms, lower ball joints, bad paint/primer, instrument panel issues just to name a few.

If you choose to stick with the truck, good luck with it, they are great after you work the bugs out.