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I have a PO306 code on a 2005 Hyundai XG350. If the plugs are not the problem would cleaning the fuel line be the next step?

I opened the valve covers and have good access.

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SOURCE: the durango 1999 is giving a PO300 and PO305 &

The vehicle can misfire for many different reasons. Your first step should be to check to make sure the spark is getting to the spark plugs. Next make sure those cylinders are getting fuel. If all those check out then you will need to check for compression loss. All of these procedures and more can be found at

Posted on Oct 28, 2009


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My 2005 Hyundai xg350 starts with high rams and then goes down to normal. After that, it is sluggish when you press the accelerator. Once it gets going, it seems to be fine.

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Replaced valve cover gasket. Install everything back. motor does not starting.

check the firing order of the leads when you changed the plugs.

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the pressure is good so rule out mechanical fault
injectors being cleaned and tested so rule out injectors
fuel pressure not tested to see if it is average or minimum
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That is taken from Michael on fixya. I google the codes and that came up..

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