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Re: two problems, possibly related?
ECTS and EGR are common causes of wacky idles, replace the ECTS with one of the new all-brass designs, and clean out or replace the EGR.
a new tensioner is a possiblity, but i've never delt with one myself.
the ECTS or EGR may also cause the vibration, but more likely, its bad mounts, lots of times you can just look at the top mount and see if its bad. if its that bad i would go ahead and replace all four
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