Steve W chip absolutely transforms an otherwise stock 3.2, even one with very high miles. But yes, it helps to keep the tach at 4K or above.

I've heard about that jumping idle before. They sometimes do that when they get really hot. 964s do it too. Sounds quite funny actually.

Regarding the 3,2 it sure comes alive above 4000 rpms, but it does acutally pull pretty good at low revs also. It has a nice low end pull in my opinon.