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It would help if you told us the year and model?

Thanks for the pics <img src="/forums/graemlins/50.gif" alt="UFO" title="UFO" height="82" width="124" /> <img src="/forums/graemlins/50.gif" alt="UFO" title="UFO" height="82" width="124" /> <img src="/forums/graemlins/50.gif" alt="UFO" title="UFO" height="82" width="124" />

Order up one of these. Should fix all your problems. <a href="http://www.amazon.com/Kensington-Reducing-SmartPhone-including-iPhone/dp/B0031U1ATQ" target="_blank">Kensington Noise Reducing Car Audio AUX Cable</a> If you don't think it works there are some vids on u-tube before and after...

What engine is in it?

i had a 2002 envoy with the same motor, no matter what oil i ran in it for the first 5mins on a cold start it would knock. It's piston slap and GM says its normal. All most all 4.2 do it on a cold start up dont worry about it.

The shim is built into the buttom of the bucket, no service is needed unless you hear clicking at idle. What engine?

Tighten both the alt belt and PS belt. If they are cracked and weathered replace both belts and tension them properly. This will fix your issues.