2017 mustang gt Running awfully bad


New Member
Jun 13, 2019
Installed a JLT cold air intake , texas speed long tube headers and x pipe and tune from a well trusted tuner , installed a 2018 intake and car started throwing a code of 2004 and 2005 changed bk to my stock 2017 intake and ran great , tried the 18 intake once more ran great with it and a tune, but started busting out at all speeds about an hour later , went bk to 17 intake and it's doing it worse than ever now , leaning towards the fliwmaster 10 are the problem but never had this problem and they were on it then , everything runs perfect on the computer , any ideas???
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