My 2004 2.7 sedan, fuel not flex has a code 300 and a sputtering issue. We have replaced all spark plugs and coil packs, its still doing the same thing. It has left me stranded several times. Please help?

If your truck has spark plug wires, you will want to change those as well, as a bad wire can cause an ignition coil to short itself out internally.

Could be, could be weak fuel delivery, weak coil pack

The spark and fuel system needs to be inspected.--------- The spark plugs are getting fouled or very loose, can cause sputtering problem.Inspect the spark plugs and coil packs.The spark plugs gets power from coil pack.If the spark plugs are very old and dirty, then it needs to be replaced.--------------- The **** problem also relates to faulty worn out spark plugs or clogged fuel filter or low fuel pressure or problem with ignition coil pack.----------- When coil pack stops giving power to spark plug the car will **** while driving.---------- So very first thing you get tested is spark plugs and ignition coil packs.If they are tested good, but looks very dirty/ worn out, that can also be the reason.----------- But if spark plugs and ignition coil tested ok and cleaned properly, but still same problem, then get fuel pressure tested.If fuel pressure is low, the fuel pump and fuel filter are the cause of problem.----------- ------------------ Also one more thing, " IS there check engine light coming ON dash" ? If yes, then get the car scanned at autozone service center.Its absolutely free to get car scanned at autozone.They do it for no charge.------- In scanning you will get error codes, as per error codes, it will point towards faulty part, causing this sputtering and jerking problem.----------------- But if there is no check engine light ion dash, then get the above mentioned possibilities checked.That will help.Thanks.Helpmech.

Hi, I recommend you get a free scan at your local parts chain and write down the trouble code. I suspect you have a bad crankshaft sensor, but the scan will confirm. Send us the trouble code if you would like further assistance, and thanks for using FixYa.

Your car has four coil packs, coil packs set on top of valvr cover, remove bolt that holds coil pack, pull coil pack out, and with extension and spark plug socket remove spark plug, do the same with all.Hope this was very helpful.

The difference in plugs would not make it misfire . Is the check engine light on ? Most times when it is fuel system related it will not throw a code . I have installed new plugs that have been dropped and misfired but this is something that you will have to diagnose if it's one cylinder or multiple misfires. Please let me know if i can be of any help.

A flashing light is BAD. Its damaging the cat converter. I would check or replace the spark plug wires ( if all OK, then) replace the coil pack. I would not replace anything unless they test bad. but these car are known for bad coil packs.

Which codes are you getting? Did you change the wires? They tend to fail quickly. Also check to make sure you are getting a good strong constant spark to all plugs. If not, coil pack or module may be faulty. Also check your fuel pressure

could be many things cam sensor crank sensor fuel injectors or the coil could be the issue if its a multi port fuel injected system.

HELLO do you have a spark tester????I have seen regular spark plugs show NO spark then plug in s spark tester boom spark rods about 1/4 inch shoot out!!!!!!!! okay so cam shaft sensor code appear then multiple cylinder miss fire code! sure sounds like one of those two coil packs are not producing!!!! think about this:how can a cam sensor work in harmony when the computer is malfunctioning due to multiple misfire! your car has thrown SOS codes to you through on board diagnostics Morris codes your ignoring them!!! if I was you I would take those coils and test for spark with a "spark" tester keep in mind to check them for resistance with a volt meter tops take out spark plugs they are probably soaked replace them to!!!!good luck I hope my shared experience has help you some what! John