Saturday, May 06, 2006 - 12:40 pm, by: Blaine Hanson(Blaine)
Probably totally unrelated but worth noting ....I had a similar problem recently with rough idle at 600/650 and I was having to put the transmission into Neutral at the stop lights to keep the revs up, but all was ok at higher revs. All this happened when I recently replaced my alternator. I disconnected a grey sensor plug going onto the bottom of the radiator left side (battery side) in order to get the alternator into position easily. The next evening I woke up in the middle of the night and remembered I had disconnected it. I reconnected it the next day and the engine idles " normal " again, no rough spots. So it maybe worth checking this connection / wiring.