I forgot to respond on your vacuum gauge analysis which is perfect. The 110 mile column of air, entering the intake manifold is relentless in it's insistance on entering the engine.
I generally rest my accelerator foot on the tranny tunnel on the right side of the foot, to minimize even the minuscule variations in throttle position, since using a vacuum gauge.
Preheating the intake air on the Sentra has created some interesting effects as temps here rise. Throttle response in top gear has dropped noticeably and it wants to downshift
(automatic trans) more readily. Based on your posts I think I'l lleave the WAI connected, since the only way I could accomplish anything similar to a "lean burn" benefit is by the reduction is effective atmospheric density due to the WAI.
regards
mech
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