2008 liberty rough idle crank

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Mlvr

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Hello
2008 liberty 6 cylinder
When I turn the key it cranks and fights to start. If it does start it has a rough idle and I need to hit the gas to keep from stalling. Lastly there is a loud knock from the passenger side and I hate to say it's coming from the valve cover. The engine light and thunder bolt symbol both light up with the bolt flashing. It also will now continuously crank as if starter is stuck when turning key. It ran fine , ran a errand and came back to this. Anyone else?
 

LibertyTC

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This does not sound good.
How is the battery /alt voltage, get them tested/checked over!
Get the codes read and post back the problem codes.
 

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