[82Stang]

Hello,
I was working on a 2000 Pontiac Sunfire, my mother-in-law's. She said it ran like crap so here's what I found out after looking at it. I checked all the fluids except the trans because it has a cap down there and I removed it to see, but couldn't see anything. They usually give you some kind of a mark to go by. Not so lucky here though, I hate these kinds of cars. Meaning cheap cars are hard to fix. So, didn't really get to check the tranny fluid! I used a scan tool by Actron and got the codes PO300 and PO440 twice, meaning there were three codes it pulled. The first, PO300, was a random/multiple cylinder misfire. So I figure it needs plugs and wires, but they look new, so maybe coil(s). The second and third were PO440 evap inefficiency. Scanner said both and I was confused since it gave me the same code for 2 and 3 of the codes. The display had an icon after the third code of which I have no idea what it is except to say that it looked like a small case b over a small case d, or musical symbols! So, my question is what could be causing the misfire if the plugs and wires are new... and what is the evap code, maybe a bad canister or I checked the gas cap and it was tight? So, I'm pretty much not getting any answers to the actual causes here. If you can offer me some input or direction, I'd appreciate it greatly because at this moment, I don't know what to do with it, except drive it off a cliff!
Thank you.