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Discussion Starter · #1 ·
I have a 2018 MKZ with the 3.0T AWD. I have a 91 tune and tuner says the car is underperforming. Have data logged and gone back and forth and still am with tuner. I am wondering if anyone else has had an issue with these vehicles. I bought the car off carvana and when changing the plugs I noticed they were already at .028 which is common for tunes makes me believe this car was tuned at one point. I had a 2013 SHO and the tune I got for that car was a night and day difference but it did not have these issues. Any help or feedback would be appreciated.
 
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