1990 200 missing/lean under boost

[Huw Powell]

> Tony, from what I understand about o2 sensors, is the measure
> presence of oxygen, not fuel. A lean mixture will result in less
> oxygen, and a rich mixture in more. A misfire would mean more fuel is
> unburnt, resulting in less oxygen, showing lean. If I am wrong,
> please correct me..

You are correct that they measure oxygen, then you got all the rest 
exactly backwards.  Lean = more oxygen, rich = less.  A misfire results 
in more oxygen, since it didn't get used burning fuel.

Huw