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RPM Issues

I have a '99 Chrylser Cirrus that has been randomly increasing and decreasing RPM (but stays at the same speed) intermitedly while I’m driving. Dignostic test found nothing wrong. Any ideas?

Yup. The diagnostic test checked the engine, which was running fine. What’s probably going on is that the engine is not solidly connected to the drivetrain. This is a job for a tranny shop.