The LDA does not and will not change fuel delivery rates at idle. It can with enough throttle input change the fuel rate.
Pull the top of the LDA off and while the engine is running at idle push the diaphram down, you will not see a change.
The way the LDA works is by limiting the tension lever travel, only with enough throttle input will the tension lever hit this stop.
You would not want the LDA to control fueling without throttle input, as you could be engine braking down hill and still be able to produce sufficient boost to get higher fuel delivery, then there would be no engine braking at all.
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