SPARTA -- Federal Mogul Corp. plans a $3.7 million expansion at its foundry.. Though the project will generate only a handful of new jobs, the good news for the village may be that the plant at 200 Maple St. stays put. "Keeping the employment in Sparta is huge," said Village Manager Sharon DeLange. "We've heard rumors for a long time that they might be pulling out." The plant, which employs 179 workers,…