97 Ford Powerstroke

Idles fine and drives fine . Just at low RPM's when in gear, like leaving a stop sign it surges like lack of fuel but has new pump and full pressure. Once RPM's get to around 1200 it smooths out and runs like a champ. Its not the injectors. It is either the injection pump or a sensor. Does anyone know about this or seen the same problem?

Man, I have got an 96f250 with 242k on it and a 96F359 with 227k, and it has started to iddle a little rougher than I like. sorry don't have any sugestions. how many miles does your truck have on it?