Well, here's an update, it seems that sidekick had a rough life, under it, it's perfored almost everywhere. It looks very clean but that's not the case when you take the time to look at all those hidden places.
It started really good but it ran at 3000 RPM for a while, whitout me even touching the gaz or anything else. I will see if he sells it, which I think not in this state, and I will do an offer with minus a thousand dollar.