Cross-threaded spark plug.
Other causes include injector, coil, wiring, and internal engine problems.
My stealth doesnt misfire
P0308 is cylinder #8 misfire. See related question below for info about misfires.
P030* basically means a cylinder has a misfire. P0301 is cylinder #1, P0302 is #2, and so on. P0300 means that there are random misfires caused by a vacuum or compression leak, little or no spark, etc.
It depends on what caused the misfire, and it depends on what you mean. If you are having constant misfires, then there is either something wrong with your ammo, or there is something wrong with the pistol. If you mean what is the proper procedure for clearing a misfire, then you keep the gun pointed in a safe direction and rack the slide to eject the bad round, or open the cylinder and eject it if it is a revolver.
The heater core will not have an effect on the check engine light. See related question below for more info on misfires and engine light.
With multiple misfires originating from the same coil pack, my guess would be to replace the driver's side coil pack.
try changing the cap and rotor
It means that more than one cylinder has a misfire history. PO301 would be cylinder number 1 misfire. PO302 would be number 3 cylinder misfire.
po300-Random/multiple cylinder misfire detected. po303-Cylinder no. 3 misfire detected. po306-cylinder no. 6 misfire detected po300-Random/multiple cylinder misfire detected. po303-Cylinder no. 3 misfire detected. po306-cylinder no. 6 misfire detected
P0305 and P0306 indicates that cylinder number 6 is experiencing misfires. A misfire occurs when an insufficient amount of fuel is burning in a cylinder. A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure
this could be caused by a fuel problem, not spark. check to see if your getting spark to the plug. ck to see if the injector is firing, and run a compression test on that cylinder