high rpm

Hey all, long time lurker first time poster. I pride myself in being a pretty good automotive troubleshooter, but this issue has been absolutely kicking my ass on my fresh engine and setup. I need the help of the MPS hive mind. ENGINE/DRIVEABILITY Year/Make/Model: 2010 USDM Speed3 Mileage...

I had a random misfire on stock hpfp internals, so I figured I needed better fuel flow, upgraded that everything is fine with it, still having the high RPM random misfire and it only misfires when Im done accelerating(slowing down) , Im going to change the spark plugs and clean the vaccum lines...