how old is the fuel in the tank? If the car was sitting for a long time, drain the tank, inspect for rust in the tank. Also change the fuel filter. Not a bad idea to have the injectors cleaned. If these things don't clear up the misfire, you'll have to start doing tests like compression test, leakdown test, etc.
Also, yes you can just remove the AC belt and it will disable the AC system, sounds like the compressor needs to be replaced. Hopefully it didn't frag. If it did, the entire AC system will need to be cleaned out before it can be put back in service.
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