idling high 2k, 5sfe mt Options

[ILoveMySilly97]

The idle is fine all the time except when i drive it over 2k rpm. Then when i press clutch the rpm goes down to 2k and idles. The only way i can get it to normal again is to rev up to 2500rpm. Then it drops to 800. I'm thinking the diaphragm might be bad? This happens once in a while. One day it happens next day it'll be fine. A week later it does it again it sometimes a couple days later. Please don't say to clean tb.

1997 ST204
5SFE @ 212k miles
S54
2.75" CAI
2.25" catback-decatted

[Box]

Have you ever cleaned the IACV? What I'd do is do a quick check for vacuum leaks, with the car running spray some carb cleaner around the intake and throttle body and around any vacuum lines. If you can get it to get stuck at the 2,000 rpm while sitting then if it is a leak it'll be easier to find. Anyhow, if it starts to bog you've found the source of your problem. Another thing is to reset the ECU and drive it around for awhile and see if that solves it if it isn't a leak or the IACV. I had a similar issue where it'd get stuck at 1,400 or so and after resetting the ECU and driving it around it fixed itself. I looked for leaks etc... like a mad person to never find anything.