Slight vacuum flutter at idle

[X-ZZ4]

Ok, so now that it is running very good after that wondrous oil cap, and now that I have my boost gauge installed, I'm going after perfection.

The idle has a very slight roughness to it. Very slight. You can barely notice it by feel, barely on the tach, but you can definitely see it on the boost gauge.

Other than continuing to troubleshoot vacuum leaks, any suggestions?

Only thing I have on deck right now are to change out my plugs, I have Brisk USA DOR14LGS-T just sitting on the shelf waiting for my to install. But my NGK's are pretty fresh, maybe 3-6 months old.

No codes, runs great other than this. I'm tempted to just not mess with it until something else breaks, not even the plugs. But that little flutter does bother me a bit.

Here's what it looks like....

[Terry.Reese]

Have you checked the cam shaft position sensor? Mine was doing that and i replaced it ands poof.. no more shudder.