p0300 problem solutions

Question

rough idle, bad accelleration, gas mileage down, worse when raining engine sputters on takeoff but catches up at higher speeds and responds normally. lags slightly at start up

Answer 1

P0300 code means that one or more of the cylinders is misfiring. There are many things that can cause a cylinder to misfire.

More information here: https://www.autocodes.com/p0300.html

The first thing you need to do is to try to isolate which cylinder(s) is misfiring. Once you know the cylinder that is misfiring, then you need to find out if the problem is the spark plug, injector or an intake leak.