Had my fuel pump adjusted having the same issue like yourselves and so can't say these were the issue with me?
Added a washer to this part that corrected the rpm to rise with the AC rather than sitting on the same idle.
There is also a vacuum sensor for the ac next to the fuse box with two pipe coming out that's worth looking at as if this is faulty this can cause the rpm to fail to rise. Don't have a picture of this part unfortunately.
Hope this helps you a little Jose
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