Hey everyone,
I just read this code of my ECU today since my car is running like crap. Its boggy and idle is bad. About 3 weeks ago I had a cylinder 4 misfire in which I replaced the ignition coil and that seemed to fix the problem. I never cleared the ECU so whatever code was there was still there. Now I read the ECU and picked up a Multiple Misfire P0300 code. Could this be just another ignition coil, if so is there an easy way to figure out which one is bad so I can replace it.

 

multi cyl misfire can be cause by a number a things....

I Improper spark plug
I Insufficient compression
I Incorrect fuel pressure
I EGR valve
I The injector circuit is open or shorted.
I Injectors
I Intake air leaks
I The ignition secondary circuit is open or
shorted.
I Lack of fuel
I Magnetized signal plate (flywheel or
drive plate)
I Front heated oxygen sensors

 

Long List huh.

 

yea.....I would look at Oxygen Sensors, EGR Valve first...those are common problems