I chased my misfire for a year before I gave in and actually took it to a mechanic.turns out I had four wires that had rubbed raw somewhere.they were sending a seriously screwed signal and thus causing misfire.

 

the only time i had any misfire problems and a **** idle was due to the tune as for plugs ngk stock number 4644 that is one step colder copper core plug then the stock ngk that came in these engines which is a copper coree plug also

 

this, intake side leak or bad plugs, coils, etc

 

I recently upgraded FROM 42s to 60s,
I still have my 42s if you want em.

 

I just talked to a follow 2.2 on a 3.065 pulley who has 42's, and they are running at 96% duty. Ill stick with my 60's to be safe

 

honestly bro, think about the code for a second: p0300: random misfire...if it was an injector issue, don't you think it would've given you a specific cylinder where the misfire was occurring? Here's my advice: pull the spark plugs and get out a spark plug chart. Spark Plugs are a great tool for diagnosing random misfiring b/c it can help you narrow down the problem from fuel, air, or spark issues. Obviously, we can rule out compression b/c your car is fine. So checking the spark plugs for all the tell-tale signs will help track it down.

 

That's true, but I have less than a thousand miles on my plugs, so they will probably be new looking

 

lol needs a new tuner

 

i had less than 1000 miles on my car when it had ottp's stage kit (2.8, 60's, blah blah), and when I pulled the plugs on it I could tell right away that I had a rich condition in my car. Those plugs smelled like they had been bathing in fuel.

 

Random Misfire Code can also be caused by a faulty / failing crank position sensor.

 

I have this problem under deceleration. Yes I have 60's, 2.7, bkr7e copper plugs, trifecta tune.

 

Anyone still having this problem with nothing obvious to point to, should do a Crankshaft position (CKP) variation learn. This solved my CEL and idle issues. Even feels like the car picked up a little.