Pre Market analyst calls

• Affiliated Computer Services (NYSE: ACS) Raised to Buy from Neutral at Goldman Sachs.
• American Electric Power (NYSE: AEP) Raised to Buy from Neutral at Banc Of America.
• Calpine (NYSE: CPN) cut to Hold at Jefferies & Co.
• Chevron Corp. (NYSE: CVX) Raised to Buy from Neutral at Goldman Sachs.
• Citrix Systems (NASDAQ: CTXS) Started as Overweight at Thomas Weisel.
• Ford (NYSE: F) Raised to Hold from Sell at Citigroup.
• Potash Corp. of Saskatchewan (NYSE: POT) cut to Outperform from top Pick at RBC Capital Markets.
• Symantec (NASDAQ: SYMC) Cut to Market Perform at Morgan Keegan.
• Tenet Healthcare (NYSE: THC) cut to Hold at Deutsche Bank.
• Wachovia (NYSE: WB) Raised to Buy from Hold at Deutsche Bank.

24/7 Wall St.