Recently, my car (vl, NA rb30) has been stuttering from 3000 upwards, at first I thought it was clutch slip as the revs would jump once it hit 3000, but now I know it's not, because it does it in neutral too, and it stops once it hits 3500ish. Any ideas what could be causing it? I'll check my fault codes tomorrow, but anything come to mind? I recently gave it a bit around winton park, so I'll change the oil and stuff soon and clean it up, hoping I didn't do any damage. Any help appreciated

CAS maybe

yep, it was. Took it apart and gave it a good clean, cleaned the plug and now it's all fine, just wanted a second opinion