Random misfire car has random misfire and I replaced plugs wires an coilpacks whats going on with my car

P0300 indicates a random misfire - a misfire that is not consistent and not confined to one cylinder. Worn/faulty spark plugs, failing coil(s) or coilpack, wiring, connections... Fix that and the other codes will probably disappear.

hi,

incomplete tune up.
go pull codes at auto parts store then probably plug wires, fuel filter, air filter, pcv valve, the coilpack may not show on results just a misfire so the timetable is right for a cooked coilpack

Could be a bad plug wire, a coilpack, or injector/injector wire.

Check and / or replace plugs, wires, distributor cap, coil / coilpack

Change plugs especially if you have over 50k miles on them.
Wires can sometimes have cracks in them causing misfire.

Hope this helps...

It's not a cat problem or you'd have misfires on all cylinders. P0300 is random misfires, and the codes increment to show what cylinder is misfiring. P0301 is a misfire on cylinder 1, P0302 is cylinder 2, etc. You likely have a bad coilpack. Whichever cylinder is indicated, replace that coilpack.

Its possible the crank sensor is going bad,easy to replace and cost under $30. remove one plug and one bolt .

Check the coil pack. they are common to fail and the engine will usually misfire for a while and then not start when it gets cold out. you can do a quick check by removing one plug wire at a time and having someone crank the engine. the spark should jump right down the tower the wire goes onto to the base of the coilpack. if this does not happen then you need to replace the coilpack first. take the 6 tork head screws out and remove the wiring under it that goes to the module. carefull not to mix up the wires under the coilpack or to the spark plugs. reinstall the coilpack and reinstall the plug wires and try to start the engine. i will look for a response incase you need more help. good luck.

you will need to replace the wire/coilpack for the misfiring cylinder.

Sounds like the ignition wires,from the coilpack to the plug,or the coilpack itself

PO300 is Random Misfire and can be caused from a variety of things from Spark plugs to wires, to coilpacks, and most common and overlooked the clogged fuel injectors which you cannot clean by putting something in the tank, you positively must have them professionally cleaned or replaced to fix them,