Hi, I had this problem with my 1998 daewoo nubira cdx sation wagon, the fault finder they hooked up said there was a fault with the throttle body so they replaced this twice before realising the "IAC UNIT" was faulty (This is to do with the 'ECU' apparently), The fault with the 'IAC UNIT' caused the wiring to arc and cause the said problem. Here is the list of what they did to mine.
"Remove TPS and IAC DRIVE (Replace IAC UNIT) and REPAIR WIRING and RECALIBRATE.
This cost approx $70 for the IAC unit and 1 hour to do the job for them.
Hope this helps, Cheers, Mark
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