Low, fluctuating idle when engine is warm

Hi everyone,



having gone through 20,000 posts to try and find my problem I ended up making my own post.



Here's the story:



I drive a Jeep Grand Cherokee 3.7 Laredo with about 90.000 miles. About half a year ago I noticed that only when my car engine is warm, it would have a pretty low idle in my opinion at stops, at that point fluctuating around 650 rpm. Now, since a 2 weeks my rpm is fluctuating mildly between 450-550 rpm. I must also mention that there is no Check Engine Light whatsoever. Other things that might help you guys out: occasionally when flooring my car, it'll take 2-3 seconds for the car to react and go.



I have tried checking for vacuum leaks using carb cleaner but having no experience whatsoever (though very eager to try) working on cars Im not sure if everything I did was correct. Anyways, the things I found online:



-PCV something (no idea what this is)

-dirty IAC valve (done most research on this and how to clean it but havent done it yet because I wanted to pick your brains first)

-dirty Throttle body (same story as above)

-TPS sensor

-Vacuum leaks (though online this is usually shown by a high rpm instead of low?)

-EGR valve



The car hasn't stalled yet but with the decreasing rpm's I fear this might not take long anymore, 2 days ago I saw it go as low as 300 rpm before going back to fluctuating between the 450-550.



Since I'm going to Miami in 2 weeks (I live on an island in the middle of the ocean which doesnt have many carparts available) I wanted to know your opinions.



Thanks in advance to all of you for taking the time to read this.