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I have a 2016 mustang gt with catless h pipe & roush mufflers. Car ran absolutely great (to be stock) until I did my Cobra Jet manifold, vmp 65mm twin throttle body, JLT cold air intake, excedy clutch & flywheel. Now I’m getting misfire codes in cylinder 4 & 7. I have already checked plugs...

I have a 2016 mustang gt with catless h pipe & roush mufflers. Car ran absolutely great (to be stock) until I did my Cobra Jet manifold, vmp 65mm twin throttle body, JLT cold air intake, except clutch & flywheel. Now I’m getting misfire codes in cylinder 4 & 7. I have already checked plugs...