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So I bought this 2007 Chrystler 300 limited 3.5L rwd with 146k and the check engine light was on and it was scanning as a cylinder 4 misfire so I replaced the all spark plugs and the one ignition coil and those did not work so then I replaced the fuel injector and that worked but as I was driving home from work today it came back on and scanned as cylinder 4 misfire again. Any ideas? Any information would be appreciated