Yeah it's just a regular stock automatic civic, just trying to fix the bad idle cause it's a car that I had that's going to my sister. What could I try and do to fix the idle? The idle is really loud and isn't smooth and quiet like it should be, and it goes from 1000rpm up to about 4000, then back and forth between those two numbers for about 10 seconds. What could I do to try and fix the idle?