While MAF or throttle module are possibilities, more likely you have a valve body problem in the trans. The 01 automatic 5 cyl volvos have a system called "neutral control" It is supposed to seamlessly disengage the trans at stops and re-engage when you release the brake, for smoother idle. Symptoms of a faulty valve body include harsh engagement when brake is released, and a noticable clunk about 2 seconds after coming to a stop, and continued clunking or "twitching" as you called it. This feature was deleted on 02 models except for some early 02 non turbos.
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