1991 Oldsmobile Cutlass won't start

Welcome to the forum, thanks for the donation. To check for spark, you can pull a plug wire, stick known good plug in the boot, ground metal part of plug against metal part of engine, have helper crank engine while you watch for spark at the tip of plug.

Also check for trouble codes. Use a jumper wire between terminals A & B of the datalink connector. turn key to on position, no further. The mil starts flashing, you count the flashes to get the codes. Your looking for two digit codes. The connector Should be located, lower edge of dash.