wb6otg wrote:

> >Chad, all- I'd like to know the solution to this as I have the same problem.
> >I recall my 84 having full power and smooth idle while my (1yr) old o2
> >sensor was disconnected and I awaited the new one from BD.  Symptoms
> >returned with the new properly installed o2 sensor.
>
> An exhaust leak that lets oxygen into the exhaust system will cause the o2 sensor to think the engine is running lean, causing the computer to make it run too rich.
>
> Bill

I'm having some trouble accepting the idea that in the part of the exhaust system that is presumably under some pressure, a leak would cause air to come in.
  Could someone explain this?

Larry A.