Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Random misfire on Acura – and seems mysterious › Reply To: Random misfire on Acura – and seems mysterious April 7, 2021 at 12:38 am #989894 ms2000Participant Today I did the pinch test on EVAP and Brake booster cables when the engine is on closed loop. No change in fuel trim. I am going to build a Smoke m/c and test it or find another shop with smoke machine.