I believe it should be either an OHV 3.1 L., or a DOHC 3.4 L. in that car.
Isn't the Lumina a W body? If it is a 3.4 DOHC, and it's stalling when the
cooling fan comes on, I remember there being a service bulletin on this.
The fix was, believe or not, all new injectors with an updated part number.
Anyhow, the 3.4 DOHC was stalling on my son's 92 Cutlass Supreme when the
fan came on and injectors fixed it. Expensive fix it was, too. And a PITA
to change on that engine.
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