Cadillac DeVille erratic mph reading and stalling at 35mph on Cadillac DeVille

Some Cadillac DeVille owners report experiencing erratic mph readings and stalling issues, particularly at 35mph, which may indicate potential transmission problems. These owners have noted that the transmission can seem to disconnect, leading to a loss of power. Additionally, fuel-related issues, such as bad gas or water in the gas tank, have been reported as causes of stalling. Some owners also experience rough running and difficulty starting, suggesting underlying engine troubles related to sensors, fuel pumps, or other components. Furthermore, electrical problems, including a faulty key or ignition system, can lead to intermittent starting and stalling while driving. It is advisable for affected owners to seek a qualified mechanic for a thorough inspection of the transmission, fuel system, engine diagnostics, and electrical components to address these serious issues promptly.