1993 Oldsmobile Achieva 1993 Achieva Won't start

The car was running fine and has since day one. Never had a problem.

About a week ago when I tried to start the car it cranked over but wouldn't start.

I replaced the Coil Pak Housing cover, put in new spark plug boots and put in new spark plugs. Also replaced the fuel filter near the back passenger side wheel well.

The car ran great for 3 days. It sat for 3 days and won't start. Just cranks, suptters and tries to start.

Still won't start. I pulled the coil pak, inserted spark plugs in the boots and grounded the plugs to the block while someone was turning over the car. I see lots of spark.

This car has had plenty of TLC and well maintained. I can hear the fuel pump whining when the key is turned on.

The car is outside under a carport. The tempeture is about 10 degrees. So starting is a chore.

Do you think it's the injectors or the fuel pump or could this be electrical?