Gas guage - Garbage

99' A6 Quattro with less than 30K, the infamous jumpy gas gauge did it to me yesterday. No beep, no instrument warning, just simply ran out of gas. The check engine light came on with NO indication of empty tank (gauge showed 1/3 of tank-full). Towed it to the shop and they pulled the codes: 1) low gas, and 2) no gas!!!. They had to clean the injectors before they could clear the check engine light. The gas gauge was always jumpy but it never failed to give a warning at the 2 gallon level (not yesterday!) ; I think when it gets cold (