sorry iv been out of the picture for a few weeks, a lot of it you can do with minimal tools. all you have to do is lift the car (how ever you choose to do it) and start with checking your wheel bearings for play. if theres play then replace them. next thing just check your sensor connectors for corrosion, chafes or broken wires. typicaly doing that will tell you whats going on, usualy you will not have to go as far as i did in the first write up.
2002 GMC Sierra 4.3 (W), 5spd, 4x4.
Mods: K&N drop-in, modded air box, modded throttle blade, X injectors, Flowmaster 50 series, BBK underdrive Pulleys (3pc), e-fans, personal HPT tune.