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I have been chasing down an annoying issue I've had for sometime where at idle I can hear and lightly feel the engine stumble almost like its missing. The stumbles/misses aren't following any consistent pattern and go away with anything more than very very light throttle application. From a drivability standpoint all I notice is sometimes a brief hesitation when rpms dip low during initial acceleration from stop. This happens while cold and warm in all weather conditions. No codes found.
In trying to diagnose this, I swapped my intake from the green filter and open box back to stock config thinking I would be able to better hear the issue without the intake noise. I actually found that this alone resolved the issue. Testing it, I swapped back and the problem re appeared. Taking the next step I tried Green filter WITH the lid and also saw the issue. Stock filter and closed lid seems to be the only good configuration.
Has anyone else had a similar issue and or fixed it by going back to the stock intake configuration? Could it be a difference in filter air flow impedance?
For reference, I am running the FRPP tune (new revision) and have a CNT catback. Other than that I am stock.
Thanks
In trying to diagnose this, I swapped my intake from the green filter and open box back to stock config thinking I would be able to better hear the issue without the intake noise. I actually found that this alone resolved the issue. Testing it, I swapped back and the problem re appeared. Taking the next step I tried Green filter WITH the lid and also saw the issue. Stock filter and closed lid seems to be the only good configuration.
Has anyone else had a similar issue and or fixed it by going back to the stock intake configuration? Could it be a difference in filter air flow impedance?
For reference, I am running the FRPP tune (new revision) and have a CNT catback. Other than that I am stock.
Thanks
