Two weeks after Hyundai took the wraps off the Theta global inline-four-cylinder engine, DaimlerChrysler announced it would sell its 10-percent stake in the South Korean automaker for nearly $1 billion. DaimlerChrysler, Hyundai, and Mitsubishi will continue to share the engine program, however. The three will build a total of 1.5 to 2 million Thetas per year, worldwide, in 1.8-, 2.0-, and 2.4-liter variants. Hyundai says it was the lead developer of this all-aluminum engine, and its bragging on the issue may hint at the source of problems in its failed association with Daimler. Hyundai’s new, bigger 2005 Sonata, recently launched in its home market, is the first model to run with the Theta, but the automaker’s old 2.0-liter iron-block Sirius four marches on in the new Tucson and other small…