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i can attest to that....
GM's "digital" EGR setup used from the late 80s-1995 that have 3 solenoids to make a combintation of 8 flow rates(without accounting for the change in flow from manifold and exhaust pressure), if i command on the smallest solenoid at idle, there's quite a stumble, eventually gets close to it's normal idle characteristics. medium solenoid, large RPM dip, almost enough to stall the engine. usually won't get close to it's idle stability, fuel mixture noticably off due to the O2 sensor running into it's correction limit. then you trigger the large solenoid... usually stalls, but if it doesn't it idles horribly.
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