Of course you could still find, say on roll out, that it'll go rough & too slow, might even stop if you've overdone it, because no wind aid to roatate the prop. That's when - or before really - that you revert to the 'normal idle'.
That happened to me yesterday! On roll out, the engine was beginning to run rough and was very slow to respond when I did apply some throttle. It caused me a bit of concern at the time as all the other indications (fuel pressure, t+ps) were normal. Next time I'll be much more aware and apply a tad more throttle sooner to prevent the rough running.