It only took three hours for this thread to get hijacked. I adjusted my updated rack damper bolt a couple of years ago when the car was stalling after exiting the freeway. I've had a broken air cleaner mount several times since and it never caused rough idle. One way to resolve this would be for me to remove the mount I just installed and let the cleaner flop around and see what happens to my idle. I don't really feel like testing fate right now and after spending the last two weeks wrestling with my AC system I'm taking a little break from doing anything under the hood.

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'81 300SD