Hi,
There are several things that can cause an idle related issue. However, since you had the transmission out to replace the clutch, I have a feeling there is an engine vacuum leak caused by a disconnected or damaged vacuum hose.
If you haven't already checked, that is where I would start. Take a look through this link. It explains how to locate and repair a leak.
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Also, if the check engine light remains on while the engine is running, have the computer scanned for diagnostic trouble codes. Most parts stores will do it for you free of charge.
Let me know what you find.
Joe
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Saturday, September 7th, 2024 AT 7:06 PM