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2014 GT vacuum leak misfires

Discussion in '2011-2014 Mustang Talk' started by realmatrix, Sep 10, 2019.

  1. realmatrix

    realmatrix New Member

    Oct 5, 2016
    Roush phase 3, auto, 600rwp. installed catch can on passenger, but ****ed up and one of the barbs was loose. went drag racing was running super rich. I believe because the air leak made the computer dump fuel. I fixed the vacuum leak but now misfires at part throttle (p0300) and made loud fluttering noise. since then has been running like shit. changed plugs, but they looked ok.

    I did make 3 runs WOT at the drag strip while dumping fuel (black smoke and low power). Can the misfires cause a problem that persists after fixing the vacuum leak? id I melt my cats?

    Help please, oh yeah I alreay did crank relearn and it didn;t help thankyou

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