hi guys i tried doing some research but i wanted to make sure what the problem on my car was , i have a 02 rsx type s thats having idle issue , when ever im in neutral my rpms would go up and down (1k-2.5k) , i had this issue before with my 93 prelude and the problem was my fast idle thermo valve , could this be the same issue with my rsx or could it be the map sensor pls let me know thanks......

 

Is the car throwing any codes ?
What modifications are done ?