Originally Posted by Dave Henshall
sounds like exactly what mine did.
turned out to be the ajustment of the TPS. with the ignition switched on and the cover off the ecu multiplug, go across pins 17 and 30 and you should ajust the position (via its elongated holes) until you read 0.2 - 0.25 VDC back at the ecu with a multimeter.
Ive just done this for my 4x4 engine, after long term suffering from high idle (the ICSV has just been left unplugged).
I did also replace the TPS.
Set it as you described above, plugged the ICSV back on and it idle's perfectly for the first time.
And i did not have 0.2 volts at the ECU, so it was adjusted incorrectly.
Still yet to drive it so cant be 100% sure, but already i know its different, as when i replace the plug the idles blips up slighty before dropping back down to idle
Well chuffed.