Naznuts, my micra would start and run ok, idle from cold was around 15000/1600rpm dropping to 650/700 when warmed up......but.....after a good run, when I came to a stop and pull the clutch in the revs would rise to around 1200rpm, but then drop to normal idle. I did the solder mod, but it didn't really do anything in case. A replacement TB ( even though it was an used one ) was the fix for me.