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Did you fix it? I had a similar problem. The manual is wrong regarding the TPS, should be yellow and black wires which will correct your voltage readings.
I stripped and cleaned my throttle bodies - they were filthy inside the diaphragm caps and slides. After that, I syncronised all butterflies using a thin stainless strip to under the butterfly. Once refitted, they were syncronised using the air screws as per manual. It now idles perfectly.
My thread is on here now with a link to my blog for more info. Good luck.
 
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