RE: 1998 Neon Diagnostic codes Help!
Easiest and cheapest way to start is with fresh plugs and wires. Don't other with Platinum plugs, or any other expensive plug... The cheap copper plugs work the best in all but the most built-up Neons. Bosch, Champion, NGK, and a few others make copper plugs that run $1 each or so. They may not be gapped properly when you buy them. Just ask one of the sales people to give you a hand with that, takes all of 10 seconds per plug with the right tool. They may even help you install them, which takes a special socket ($4 or so), a socket extension ($3 or so), and a ratchet ($10 for a nice one), or you can spend $15-50 on a really nice socket kit that will have everything you'll ever need for most jobs.
The plugs only have to be put in a little more than hand tight. The head is made of aluminum, so twist too hard and the steel threads on the plugs will eat away at it.
Wires at a parts store shouldn't run more than $25. Very easy to install. Might want to do them one at a time so you don't lose your place.
The coilpack is a bit pricier, in the $100 range if I recall, but I still have my original after 240k miles now so I don't price them much... That's held on with a few bolts, also pretty easy to install.
After each thing you do, remove the fuel pump fuse for a couple of minutes and see if the code(s) come back. The fuse is in the box right behind the battery under the hood. Pretty sure it's the only 20 amp fuse in there (yellow) and labeled well. I use a Gerber to pull it.
Actually, before you start on any of that, check the connector going into the coilpack (red thing on top where the spark plug wires connect). Mine has a tab broken off and wiggles its way loose every now and then, causing a misfire code. Free fix, just push it back in. I had tie wraps on it for a while to keep it in place, probably should do that again here soon...
Best of luck!