How long can the ecm be disconnected from the battery before it starts to 'forget'? I've had my car in storage for awhile now and crank it up every month or two. The battery is disconnected during this time. It has always cranked, but sometimes take a few minutes to start running 'normal'. But this last time it doesn't start at all. I have fuel pressure and spark and plenty of battery, but the starter just turns and turns. Thoughts?