Ralph Report post Posted May 4, 2012 I have installed a toggle switch to disconnect the battery on my 05 Malibu. After towing and restarting engine it runs very rough for about 10 to 15 seconds. Is this normal? Share this post Link to post Share on other sites
hermanmullins Report post Posted May 4, 2012 Ralph, Welcome to the Forum. When you disconnect power to your ECM (Engine Control Module) It has to reprogram itself. You can get a rough Idle for a short time. Some units can take up to 100 miles of driving to relearn. Herman Share this post Link to post Share on other sites
