[Compelica]

I'm trying to troubleshoot an LTFT behavior only at idle where LTFT tends to fluctuate a lot, around 3% to 9%. This happened when I recently changed from a 2013 decatted header to a 2017 decatted header.

Previously it used to remain about 2% to 3%, and the rest of the LTFTs in other RPM ranges are about 1% to 3% unchanged. Now I understand this isn't 'much' by any means but I'm trying to understand the possibilities/reasons on the change as it hadn't happened before.

What I've done to diagnose so far:

1. No audible air leaks at exhaust and intake. Car is NA, unclamped hoses at intake look good and tight.
2. O2 sensors are screwed tight. Voltages are at 2.2V at front and 0.7V at rear, will need to reconfirm.
3. ECU reset does not change anything (for the heck of it, why would it). Tune is unchanged on Wayne's tune with the same MAF scaling.
4. Intake tubing past MAF is OK, no cracks and clamps are tight.
5. MAP is reporting approximately 33kpa (~0.33 bar) on idle.

Anyone with any ideas? Thanks!