have a 2000 s80 t6 it has the yellow sticker electronic throttle module (etm) but its acting up. I beleive because the sticker is yellow this one had already been replaced? I have it removed and now i'm at the junction of do i clean it and put it back in or do i send it out to someone like xemodex for a repair and return? It does have a ton of build up inside of it that needs cleaning i'm wondering what the success rate is of cleaning these and fixing the problem as it would be a pain to put it all back in and have it not work again. car symptoms were cold start won't hold an idle studdering and wanting to fall on its face until warmed up.....then when driving sticky/jumpy acceleration from stops and if you give it to much gas it'll throw the computers and go into limp mode and stall. Turn car off and restart and you can drive it again.

any input appreciated