Yea go back check all your vacuum lines and make sure you don't have anything crossed. I had an EGR gasket not sealed correctly and had a high idle when I pulled my motor.
Also, there's a IAC valve (I think that's what it's called) but it sits on top of the engine close to the firewall on the driver side. There's a metal plate on it with 2 screws u need to take off. There's like a white plastic washer inside that comes loose. You have to rotate it back tight and it will fix your idle issue. Check out Eric the car guy erratic idle video on YouTube.
My car no longer idles up and down anymore!
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My 95 Acura Legendary