1994 Grand Am - sputters

My son's 1994 Grand Am recently started sputtering. This would happen when he first started the car - and most recently while out on the highway going 65+ mph. We replaced the spark plugs - and now it won't start. Besides replacing the spark plug caps, is there anything else we can do to get this car running again?
Could the sputtering be caused by a bad ignition coil?

Any help would be appreciated!

could actually be a bad alternator - also sounds like the cat converter could potentially be plugged. I dunno about the coil though - I guess you could try it if it wasn't the cat or alternator.

If it is cranking but wont fire, check for spark on each wire. Pull off each wire at a time put one of the old plugs in it and touch it to the block while someone cranks over the engine and check for spark. (Use a pair of long needle nose pliers when you do this and hold the rubber cap not the plug. You will get a good jolt if you hold the plug and your pliers are not rubber coated on the handle) If the wires are original on the car, I suspect you have a bad wire and would replace them anyways given the age. If you find you don't have spark at two of the plugs, then that coil is bad.

we got thos silly lil plug wires 44yys also is the control module hooked up,that was something i missed when I changed theh coil pack

Car is running great...ended up the coil pack needed replaced. Thanks for your replies.
J