I have a 97 TJ with only 100k miles on it. I purchased it in September of 2014 and for the last few months my check engine light has been on. The self diagnostic test showed a series of 43's which indicated multiple misfires in the cylinders. I know that a TSB was put out for bad valve springs in the 97-98s. How do I verify that this is the cause of my issues before I pay to get them fixed?