I read a few threads about this and I still have not read any legit soultions for this.
My problem is as follows:

When driving as I begin to stop I down shift to say 2nd and then before actually coming to a complete stop once I press the clutch in the motor shudders dips low in rpms and then returns to normal. All of this is a matter of about a second. Sort of like I slowed down too much for the gear and the car is about to stall. (However I am going fast enough for that specific gear) I know it isnt clucth related because even in neutral I can sometimes get the same effect. If I sit there and just blip the throttle to about 2000 rpms when it comes back down it dips low and then is fine. I am curious to know what it could be. I have a 2003 with about 35k miles. I have a clean air filter and clean throttle body. At fist I thought maybe my clutch was getting hung up, but once it started happening in neutral I knew that was no longer a possibility. I know a few people have had this happen, so I am just wondering has anyone here been able to fix the problem? Or are we all just living with this minor problem?

Thanks, Tom

 

Mine does this too, but only when the AC is on.

 

From what i remember reading on threads, this was a commmon thing among s2000's, try searching it should come up that alot of people experience it. One thing I remember reading was if you push in the clutch closer to 1k or closer to where it idles it won't do it, but if u push in the clutch at a higher rpm it usually dips down below idle and shudders and shots back up to normal idle.

I know my s2000 does it, but yea search it I remember there being a number of threads of people asking if it was normal, just seems to be a s2000 thing.

 

clean behind the throttle plate and clean out the IACV

 

https://www.s2ki.com/s2000/topic/386...-stalling-etc/

Here is the post from the DIY section...

 

Seems like trial an error kinda thing haha thanks