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1997 1.6L: at around 70,000 miles, suddenly began idling very rough which smooths out as rpms increase. has 100,000 now. did all of the recommended smog and ignition component replacements, replaced all four engine mounts. Suspecting a cam ware or valve spring issues. A burn’t valve would have...

Well, Betzy... thanks for the thumbs up. Oddly... absolutely no other replies. Still not able to find the source of the vibration.

For years my 97 1.6L corolla has been idling rough only when in gear. Smooths out immidiately as rpms increase. I have replaced all 4 mounts, looked for vacuum leaks, cleaned throttle body, new plugs, (all used plugs are gray/brown when removed). Replaced both o2 sensors... Started around 60,000...