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Thanks for the tip, I'll try that!

Yeah, I get that it's crude and simple. There were/are perfectly valid reasons for that. I think you misunderstand the reason for my question. I'm not looking for comfort, I'm looking for problems. As long as the rattles and hums are normal, I'm good with that. This wasn't a complaint, I was...

I put foam on the inner fender panels. Those were the "air grates" that I referred to earlier. As you said, the engine bay side panels buzz a lot to I'll attack those next. One reason I want to quiet everything down, is so that I can hear when "abnormal" sounds appear that indicate real problems.

Ok, cool. I do use the hand throttle to keep the RPM's between 700 and 1000 rpms during the 5 minute warm up period. Then, I release the hand throttle and it settles at 600. The "wandering idle" that the truck did when I first bought it has completely stopped since I cleaned up the fuel system...

I did run through the search function and didn't find what I was looking for...not exactly, anyway. Symptoms on a '71 M813: I seem to have a fair bit of vibration at idle, just sitting. The vibration is everywhere. The tailgate rattles, body panels rattle, the tool box lid rattles, the cab...