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I wonder if it's something to do with coast mode. With the LS1 ECU (from memory) when you lift off the IAC wont drop the idle back down to the stationary idle, it leaves the throttle cracked slightly. I think it does this so the car drive is smoother and not so jerky when you lift off the gas and coast (less engine braking). Once the speed drops to a certain number it disengages.
I remember Garret having trouble with it on his blown setup as the mode was causing the motor to keep pushing under brakes and he didn't have a lot of engine braking. The tuner disabled it.
It may be the ECU looks for the signal from the brake pedal to disengage the coast mode on the later ECU.
This is all just hypothesis as I have no experience with the e38 ECU.
Cheers
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Mike Murphy
Melbourne Australia
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