Well, the Z28 took the winter off, and finally came back this last week.
Before I had a 94 Cavalier
Pros
1) Power
2) Looks
Cons
1) Drinks gas, getting 13 miles to the gallon

The question I have is could old spark plugs and wires be causing this? I put in a K&N filter, but the rest is stock. Could a fuel filter be helpful as well? And does anyone have any information on changing the fuel filter.

 

Your fuel filter will definately improve your milage, especially if it has not been changed in a long time. It's really simple to change. You just pull out the lines at both ends, on both ends you need to hold them with a wrench. Have a catch pan under it because there will be some fuel being drained for a bit. You can also find some detailed instructions and guides if you search around, but like i said it's not hard. Your spark plugs can also affect your gas mileage. They're a pain in the *** to change though. Hope this helps.