Sholom D. Comay, 53, who was re-elected this month to a second term as president of the American Jewish Committee, died of a heart attack Saturday while driving with his wife in Pittsburgh. Mr. Comay practiced law in Pittsburgh for 12 years before joining Action Industries Inc., which markets promotional programs to retailers. He eventually became chairman of the company's board of directors. The committee, which was founded in 1906 to battle anti-Semitism, has offices in New York, Washington and Jerusalem.