Squeaks and Rattles underhood and in dash?

[hummerdonthurtem]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by H3 Hummer:
Not sure if this is your problem but you can check or it is good information for all.

Next to the firewall are some long steel tubes that are held in place by plastic connectors. The tube just pops into them. Well if it pops out it will rattle and sound horrible when going over bumps. I took my truck in and they didn't find anything but I found this and now no more issues. </div></BLOCKQUOTE>

I also had to pop the steel tubing back into some of the connectors. I still had some minor rattling at high RPMs. The same steel tubing was also rubbing against the plastic housing on the firewall that surrounds the A/C tubes. So I bent the steel tubing away from the plastic housing and now all the rattling/vibration has disappeared.