Hey guys, so i got the check engine light and pulled these codes, p0365, p0300, and p0037. I'm not worried about the other codes since i will fix that soon enough however the P0300 Misfire is killing me. I took out and replaced all my spark plugs with new ngk 1422, and checked the ignition coil by starting the car and removing the coil to see if it they were bad but everything seemed to be working just fine. What really throws me off is that as soon as i replaced the spark plugs the code went away and then like 15 miles of driving around to see if it was really gone or not, it came rite back on. Idk what else could be the problem so if you have any ideas let a fellow brother know.
Also sorry if there is a previous post about this, i couldn't find one with this specific problem but if you know please link it.

 

Maybe you have a bad valve. Have you done a compression check and leakdown test?

 

haven't done a compression or leak test but looks like ill have to get one. also do the new ngk 1422 have the same gap as the stock ones because i didn't adjust the gap instead just put then rite in.

 

Not sure about what they come gaped with but i think on the underside of the hood there is a little sticker that shows what the acceptable gaping should be.

 

Run it for for a little then let it cool down, pull the four plugs and take a picture of them (remember where each one came from) post it up here.

 

If I'm not mistaken, those other two codes are for camshaft position and H02 sensor... both which could be causing your misfire. (Probably not the H02 sensor because it is the post-cat sensor)

 

Pull the plugs and gap them to 0.020". Reinstall them and then report back.

 

so i wont have time to pull the plugs and check for gap until tomorrow but from what i am reading online it seems the stock gap people get ranges from .020-.024 so i don't think that should be a problem but ill check and post pics tomorrow. i am also going to do fuel injector cleaning done just in case they are clogged.