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I tried to find something on this and I couldn't. I have 58,000 miles on my '02. I am getting check engine codes every so often and the guy at AutoZone said it is a misfire. I know that Ford says you don't need to tune-up before 100K, but c'mon!!! Any other Gen4 owners have this problem, and did a tune up offer any resolve? I know it can't hurt to do it. Also, what does the tune-up consist of? Thanks in advance for any and all help!!!