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This error you have with The engine is tremble like hell". You dont have this when the car starts cold ?.
On your dashboard - do you have the warning check engine light?.
I was looking if i could find something in the wiring diagram for your modelyear. Maby you can find some information or at least how the color wires go to.
http://volvosweden.se/articles.php?ar...cle_id=158 or this link directly to your year http://www.volvowiringdiagrams.com/vo...iagram.pdf
There is some info at youtube on Bypass air control/Throttle valve control and some of the videos saying that the wiring can be the problem. I dont find any measure numbers for this. But if you find anything please write it here .
Hope you understand my rusty english