Q: High idle speed on 1994 Cadillac Seville

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
My mechanic can't seem to fix the idle speed. He's put in plugs and wires. He's set it to specs. I mean he has all the code readers and tools and knowledge.
Could this be the O2 sensor?
(1) Answer