FLC OF AN MLG SLID PAST THE HOLD SHORT LINE AFTER A PROP GOVERNOR CHK CAUSED THE ACFT TO SLIDE FORWARD ON THE ICY TXWY. ALSO 1 PWR LEVER WOULD NOT MOVE TO THE RETARDED POS.

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ON TAXI OUT ALL INDICATIONS NORMAL. ACFT WAS TAXIED OUT TO RWY 3; PARKED 50-80 YARDS SHORT OF HOLD LINE TO DO PROP OVERSPD GOVERNOR CHK. PWR LEVERS WERE MOVED UP TO ABOVE 20 PERCENT TKOF; ACFT STARTED TO SLIDE FORWARD. CAPT REDUCED PWR IMMEDIATELY AND TRIED TO GET PWR LEVERS BACK OVER 'LOCKS;' R PWR LEVER DID; L DID NOT. FO ALSO TRIED; UNABLE. ACFT SLID ACROSS HOLD LINE FOR RWY 3 ABOUT 10 FT. MANAGED TO STOP ACFT FROM GOING OFF TXWY AND RWY. FINALLY MANAGED TO SET PWR LEVER OVER GATE AND STOP ACFT. TWR WAS CALLED; SIT EXPLAINED. IT BECAME OBVIOUS; DUE TO CONDITIONS; TKOF PROP CHK COULD NOT BE ACCOMPLISHED. SUBSEQUENT CHKS TO SET PWR LEVERS FORWARD AND BACK OVER GATES CHKED OK. FLT WAS CONTINUED. ACFT WAS TAXIED OFF RWY; CLRNC WAS GIVEN FOR TKOF; ONCE AGAIN ON RWY; PWR LEVER MOVEMENT CHKED FORWARD AND AFT OF GATE; CHKED OK. AT THIS POINT I SAW NO REASON TO ABORT THE FLT. BRAKING ACTION RPTED BY TWR AS POOR TO FAIR. RUN-UP AREA WAS NOT SANDED. NORMAL LNDG AT PDX. CAPT/FO DISCUSSED ACTIONS IF L PWR LEVER WAS A PROB ON LNDG. LNDG NORMAL; NO PROBS. ACFT TAXIED CLR AT TXWY E IN PDX. WE REQUESTED A SHORT HOLD ON TXWY B TO DO PROP OVERSPD GOVERNOR CHK. CHK WAS DONE. NO PROBS AT ALL. PWR LEVER MOVEMENT OK. ALSO ON TAXI; PWR LEVERS WERE TAKEN FORWARD AND AFT OF GATE; NO PROBS. DUTY OFFICER CALLED. NOTE: INITIAL FLT OF THE DAY; ACFT PARKED ON GND IN VERY COLD CONDITIONS IN GEG FOR 9- 10 HRS. ACFT WAS DEICED BEFORE DEP. ALL OTHER CHKS NORMAL.