Hi, I noticed an issue with my C30 R-design this morning, it started to rev over 1000rpm and does not come back down, italso makes a sort of whining, whistle noise and I first thought was turbo but it is coming from the box connected to the throttle body (air box I think?). Would you say it is the t...

Anyone that can give me some advise. I have a 2010 C30 r-design and this morning it started doing something odd. It is revving between 1000 and 1500 rpm and goes down to normal and then back up again, it also started making a funny noise from the engine bay. Almost like a whining hissing noise and t...