I just recently had a turbo kit installed and tuned.... Now for the fun part..... At idle the car shakes rattles and rolls. The idle is garbage 600rpm-900rpm. My wideband reads between 11-16 and it is always hunting for an idle. Most of the time it is around the 14's. I hear a clunking sound when the car is in the 16:1 range and it sounds like marbles in a can. If I give it some gas the car doesn't make the sound anymore.... I figure it is lean at idle but I'm not really sure why? I do not see any vac hoses off or anything like that.