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  1. manchildsgt77

    08 MKZ misfire and ac not working

    Having the same issues. Was a cause found. From what I found out so far online is that it could be an ECU issue or it's wiring harness. I've changed all new spark plugs and the ignition coil for the cylinder that is misfiring. But this hasn't solved the problem. I am wondering is there another way to test the system which would identify this as a ECU malfunction.