'95 90Q - besides injectors, ISV, or vaccum leaks......what else could be causing my lean fuel mix?

[Joel Lenorovitz]

'95 90Q with recurring check engine light due to lean fuel mixture in banks 1 and 2

I've had the injectors replaced under the recall, cleaned the ISV (which seemed to
cure my intermittent idle drop problem), and examined all I can see for vaccum
leaks.  Interestingly, even if I intentionally create a huge vaccum leak I cannot
reproduce the condition that sets off the light.  What else could be causing this? 
What else can I check?

Also, how much oil does the V6 12v typically consume?  I don't see any evidence of
leaking, but the level sure goes down rapidly - perhaps 1/2 to 1 quart per month.

Thanks for the advice,

Joel

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