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Hi I have a 08 jk unlimited x. It’s throwing the P0300 code. It seems to only do it when it’s warmed up. It runs fine otherwise except after it throws the code it runs rough but only sometimes. If replaced crank shaft sensor, cam shaft sensor, both upstream o2 sensors, plugs, wires, coil pack, map sensor, fuel syphon pump, battery. PLEASE HELP!
 

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Assuming you meant that you have already replaced those listed items.
Have you checked all your vacuum lines or checked the intake manifold for cracks or failed gasket?


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What have you searched for, what have you tried? This has been gone over multiple times on this forum alone.

So my suggestion is do your research. Then come back to your thread here highlighting what you've already tried along with detailing your research. This helps everyone to help you.
 
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