how to tell if a jeep liberty 03 with a 3.7l jumped time or the chain broke?

dagoddfatha1

New member
i was driving along stoppped at a redlight and stepped on the gas and it just died. tried to jump it off didn't work. it is turning over just not starting ran a scan and it said it was either the cmp or cpm sensor or jumped time. any help on how to tell or how to change it would be a great help. i know the parts alone are 400 usd and tryin to save some cash if i can.
 
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