1987 Nissan Pathfinder with the V6 3.0 engine manual clutch with 129000 miles. The Idle isn't real rough it just likes to go between 1.5 revs and about 1.75 revs constantly. Not enough to bug me but enough to abort emissions test. It goes up then about a second later back down then just builds to go up again. The problem goes away as soon as I shift into gear and start going again. After I stop or shift out of gear it faithfully comes back again.