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Its hard to tell, but first most part I would get a second option on what is going on with the motor. 99% of the time your gas cap will not cause the engine light to come on at all. I don't believe Jeep Liberty's even have a sensor to detect that. Don't drive it, a clak clak clak sound coming from the motor it self could be as simple as adjusting a few things or something more serious. Good luck and feel free to ask more questions for help.
That is completely normal for your jeep product idol ranges it does this while warming up it should drop back to 800 when completely warm or when you put it in drive and everything is a go try using a better spark plug from AC DELCO lifetime warranty ones that'll keep some of the heat under control and abnormalities in your jeep product don't forget to change your timing belt at correct interval if not sure when that is call your local dealer and ask the service dept at how many miles should you bring in for timing belt change but of course you can change the belt your self with a little determination and knowledge.