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Know this won't help much, but you're not alone. Older versions of this engine had a history of developing a rough idle. Had both an '85 and a '95 Astro van with that engine and both developed the same problem. Both were exactly like you said. Ran great but rough idle. The guy I sold the '85 to put a new engine in it at about 140k. I don't know what happened to the '95.
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