I know there's a lot of talk about ISV's going on here but...
My KV had a pig of an idle when I got it, replaced all suspect breather hoses but still had the funky idle
Try this - disconnect the vacuum hose to the brake booster and bung the end up! Solved my problem
Booster diaphragm has a pinhole, so the whole unit will be replaced shortly... Strong legs so braking isn't an issue in the mean time
