Why is my car missing cylinders 2,4,6 $ random

P0300 Saturn Cylinder Misfire Detected Random Cylinders
Pay close attention to the valves.

miss fire check coils or plugs

Fuel filter has nothing to do with miss fire until high rpm's if the filter is restricted. The ECU usually sets a code for the miss and if it is intermittent and random cylinders you will get a P0300. If it is a particular cylinder or cylinders you will get a P030* the 'star' being whatever the ECU has determined is the cylinder/s. 1, 2 , 3 , 4 etc.

Well, I would probably get a second opinion next.
A random miss code is just that, the computer is seeing a loss of power on different cylinders at random times. If cylinder number one had a dead miss you should get a code 301.
It could be something mechanical such as a burnt valve or bad rings, but that is usually on one cylinder.
At least take it somewhere else and have a compression test done.

There are few possibilities that can cause engine misfire issues. It can be issue with spark plugs or faulty spark plugs. Also get the compression test done for cylinders. If any of cylinder shows low compression then required, then that particular cylinder will cause misfire.

Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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For your trouble shooting I suggest you to refer the help oinks below. It has step by step details for many engine misfire issues.

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Click the link below:-----

Ford Explorer Cylinder Misfire?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Engine Misfire codes on Chevrolet Malibu?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Cylinder 6 Misfire?

http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Ford Explorer 5.0L: Engine Miss?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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Can cylinder misfire Damage the Catalytic converter?

http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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Car misfires and error code P0306 and P0303 is shown?

http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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Chevrolet K1500 No spark, random misfire

http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html

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2004 Ford F150: Engine Misfire and Lean Code?

http://whatisbyme.blogspot.in/2012/05/2004-ford-f150-engine-misfire-and-lean.html

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1995 Toyota LS: Misfire at idle or low RPM

http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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Toyota Corolla: Random Misfire?

http://technoanswers.blogspot.in/2012/04/toyota-corolla-random-misfire.html

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2006 Ford Freestar: Misfire on Cylinder Number 2?

http://whatisbyme.blogspot.in/2012/06/2006-ford-freestar-misfire-on-cylinder.html

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This will help.

Thanks.

Check out the AboutAutomobile.com site for NHTSA complaints. I believe there was a defect in the cylinder heads for this engine. The redesigned heads have a different suffix letter than the stock heads.

For a time, the Manufactuer was paying for the repair.

Find the cylinder that is missing,and check the compression on the cylinder.If the miss is not narrowed down to one,or two cylinders,then run a compression test on all the cylinders,if while testing one cylinder,and the gauge fluctuates up and down,then check the one next to it,it it also is doing this,then the head gasket is leaking compression into one another.

Random cylinder misfire, you will need an OBDII Scanner with MODE 6 to see what the miss count is to help find the offending cylinder.

You may get lucky and get a P0301 though P0304 code to tell you which cyling but then you may not...

Then after you find the offending cylinder you will have to figure out why its running bad... Plug, coil, injector, compression or vavle problem.

Pop the heed, see the air box on the very left? On top of that box is the Ignition Control Unit. Little black square w/ winds about 1/2"
thick....

That is the problem. Or Your MAF sensor...
I don't know how to chech the Ignition Control Unit with out the proper tester.

But the MAF is located directly below in side the box.
If you POP off the large hose that comes out of the front of the air box. You can see the MAF, spreay it some contact cleaner for electronics not BREAK CLEANER>>>>>>.

Regards

sounds like the coil pack is the primary suspect here ..especially if your miss is migrating to cylinder#2 now....other issue possible...do a compression test...head gasket failure losing compression between #1 and #2 ....also..and specifically for *other user* comment... check function of EGR valve for vacuum leak into intake causing stumble misfire shudder and engine dying issues