GM's results may be hit by sub-prime mortgages

GM’s results may be hit by sub-prime mortgages
Analysts fret that GMAC unit ResCap may have loan problems

**NEW YORK (MarketWatch) - General Motors Corp’s delayed fourth-quarter results could take a substantial hit from souring sub-prime mortgages at Residential Capital that could cost the auto maker up to $950 million in the first half of this year, analysts said. **