Whip:
It was carbon type black sludge that I had to scrub of the throttle body.
I had K&N oil filter before, 6 month ago I changed to OEM paper filter.
It's weird, the only thing that comes in mind.. I de-snorkeled the car at the same time when I changed filter.. maybe it has something to do with it..
violametallic: I don't think I have lightweight flywheel, I have no history of the car before I got it.. but I discovered that previous owner didn't know what car maintenance means
Anyway, this story has a happy ending, something did it.. either burning the clutch a bit or cleaning throttle body.. my clutch feels brand new now!
Thank you all!
Sasha