So i have a p0300 code on a 2000 mitsubishi eclipse its an automatic and it has 141000 miles and i have changed spark plugs, igniton coils, fuel injectors and mass airflow sensor and it hasnt fixed anything and i have noticed that the car runs better without the maf sesnor also something i noticed when i changed the fuel injectors it had trouble starting and now i dont even know what to do
Did you use aftermarket parts or OEM?
Did you check for vacuum leaks?
Everything i changed was orginal except for the fuel injectors got off amazon and i havent checked for vaccum leaks
Just spray some carb cleaner around and hopefully you’ll hear a change in idle. It could be as simple as a cracked hose.....
I might add that you check for spark, the coil could be bad as well......