CHEVROLET ASTRO TIRE SYMPTOM

We Have A 2000 Chevy Astro With About 160000 Miles On It. We Bought It Used And Have Had Very Few Problems With It That I Couldn't Repair...

I Need Know How To Adjust The Idle Arm And What To Do Abuot The Shocks My Tires Are Wearing Very Fast And I Need New Ones Every Couple Weeks