After turning on the car and letting it idle down I notice that there is a very slight rise in RPM but more noticable change in the engine sound when taking my foot off the brake then immediately returns to normal. If I press the brake down I notice it goes up VERY slightly and the tach doesn’t seem to move, you can only notice it by ear, it’s almost imperceptible but you can notice it better when removing foot. When I hold my foot on the brake for several seconds everything seems normal, the idle only changes when first pressing the brake or letting it go.
Is this normal operation or a vacuum leak? Anywhere I should look first?
Also should I be concerned about it?
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