Okay I recently picked up a 99 Neon from a dealer, and so far it's been a dream. No problems running, engine purrs, great car. Now, this morning I get in and the SERVICE ENGINE SOON light comes on. Not sure what's happening. I get on the internet and read, find out about codes, and as it turns out I'm getting:
code 12, direct power from the battery to PCM or something has been disconnected within the last 50 key-on cycles
code 43, a single or multiple cylinder misfire
Judging from internet search after internet search, I guess my first thing to do is to change the spark plugs. I can find some information on how to do that in general, but when I popped open the hood I had NO IDEA where to find them. Where? Where? And are they hard to replace?