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Quick update - figured out that the problem is probably too low idle, or at least that's why it is doing it when it warms up... when hot/warm engine is idling at 650 rpm !!!
That's not right and the noise/clatter goes away as soon as the idle rises above 750rpm. I think the standard idle speed is around 800 right?
So my guess is that I've got an air/vacuum leak or something like that. I wish Durametric has a simple AFR value that you can poll to figure out if the AFR is wrong for idle (confirming the air leak)...
Any other thoughts??
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