Here's what I would do:
. Change the fuel filter.
. Change the spark plugs. Use only the exact ACDelco plugs that came in the car.
. Replace the Ignition Control Module:
Zip Code Entry at PartsAmerica.com
. Replace the coil:
Zip Code Entry at PartsAmerica.com
Replace items in the order listed. Many AutoZone stores can test the Ignition Control Module and coil for free.