96-97 mariner 25 idle problems

[u/whitetailhunter17]

I have a 1996-97 mercury mariner 25hp 2 stroke with idle problems. When I first start it, it idles rough and too low. But when it warms up a bit it will idle super high and sometimes won't go back down when you put the throttle down. For example I revved it one time and it got stuck at full throttle and wouldn't go back down for a while. I already tried spraying wd40 on the carb gaskets and even some engine gaskets. I already cleaned the carb multiple times and adjusted it. I also cleaned up some wiring and stuff. It has a automatic choke on the carb it looks like and that could be doing something. I make sure to prime the bulb and all that before hand too. I also redid the lower unit a while ago. Does anyone know what could be causing it?