So my check engine light popped on for code P0300 and P0307. Did a whole bunch of research to try to figure out what was wrong and I can’t seem to figure it out. What I’ve done so far is check the coils ohm readings and they all sit at 1ohm, checked the injector ohm readings and they all sit within 13.7-14.5, the spark plugs are only a month old and it is odviosly running lean as they are coated in white, I checked fuel pressure and it’s sitting between 55-60 until I snap the throttle and it goes from like 48-62 then settles at 60ish, and I sprayed every vacuum line I could find as well as the intake with wd-40 and didn’t hear any change in idle. I’m kinda lost now would like to not take it to a shop if possible. Should I get a smoke machine and try to check for a leak that way or is there something I haven’t checked yet?

 

I'd go for compression test first. If that passes, do the smoke test. I know guys that have done it with an unlit propane torch listening to engine speed.