Codes P0300 and P0128, random misfire?

It's weird that p0452 code comes and goes. Man, I do not like to throw in the towel and take it to a mechanic but at the same time I'd hate to tear it up further driving if. Plus, I do not like just guessing and throwing money into parts. If I got a compression gauge and checked all four cylinders would that give me a better idea what the problem is? That is something I've never done before so I wouldn't even know what's good or bad, but I guess I could just look it up. Another mechanic was telling me that's what I need to do so I'm going to try that. Also, I was thinking about the coil pack. Couldn't I take it out. Hook a plug wire to each coil and plug a spark plug on the other end and look for spark just to see if the coil pack is working correctly? I do not like to just guess and go buy one without knowing that's what I need. I got lucky I was able to return the MAF sensor even though I took it out of the packaging and used it. But I don't know if I'd have the same luck with the coil pack as far as getting my money back if it turns out I didn't need it.

Well, I decided to go ahead and buy a new coil pack and that did the trick! Car is running better than it ever has. That p0452 code (fuel tank pressure sensor) I was also able to fix just by unplugging it and cleaning it with contact cleaner. So, thank goodness no more working on that friggin car! Lol. Just wanted to let you know and wanted to thank you for all of the advice.

P0133 just popped up on me today (o2 sensor slow response bank1 sensor 1). I'm hearing a whistle noise when I accelerate so I'm guessing I have a vacuum leak somewhere. Hope that's all it if. I just replaced that o2 sensor not long ago so I wouldn't think it's bad already. That engine really doesn't have a lot of vacuum lines either but I'm hoping I can get it figured out. It's always something.