If you guys see this message please Pm me, I am in need of some assistants as well. I have a 99 Accord DX with 215k, I may have screwed up just a little. I recently bought this car simply because I thought I had a whole parts car 98 Accord LX boy was I wrong. The parts I think I need I no long think I need because I cant use them. However i am getting codes p0300, 302 ,304, and p1399 I replaced the plugs and wires so far, when I bought the car and put the parts that I knew the car needed and fired it up, Idle flux bad IACV. Oh yeah not the same as the LX so I cleaned it. it doesnt idle like it did. but now, MISFIRES, what is it? The plug has fire, the Injector is injecting, However maybe not enough flow. I havent check the compression, I have lost all my tools and the people i socialize with I guess would rather pay someone to fix then to try themselves. what could this be

 

I moved your post for better response.

You need to check fuel pressure and if oK, check compression.

Losing any coolant? If yes, a head gasket problem could explain missing. Use chemical coolant test to check for exhaust gases in coolant.

I don't do phone assistance.

good luck