Odd idle...

[Quattro8880 at aol.com]

I've had this happen on my 88 80q twice. The first time it was the OXS sensor 
that need to be replaced. The secoond time is currently and I have yet to 
diagnose the problem. I know that a faulty ISV can do this as well. You can 
remove it from the car, soak it with a penetrating oil and cycle it with a 9 volt 
battery. They do have a tendency to gum up a bit.

Good Luck