It sounds like the timing is wrong
Hi Hollie, Im AL the owner of Big As Auto Repair.
Hollie, what engine do you have in the Spirit. Also has someone recently performed a Tune Up? When did the engine start back firing and running rough? How many miles in on the vehicle? Has the timing belt / timing chain ever been replaced? Please go to my Auto-Repair-Website and answer all the questions so I can help you. Here's the website: http://www.bigasautorepair.com/
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