Some have you may have seen my other post about my surging idle. I have gone through the checklist. The idle is gets choppy sometimes but not other times. One minute its perfect, next time its all over the place. After I drive the car and I pull it in the garage I always disconnect the battery. Its a habit. I am scared the car may burn. I had another 93 fox, that started buring under the hood after the car was shut off. To this day I'm still not sure why. So my question is, when I disconnect the battery how long does it take the ecm to realearn everything? I will connect the battery, drive the car to work, leave it connected and drive home 9 hrs later. Has the ecm already relearned, or does it take so many heat cycles? The car has a sct base chip. It will be tuned in a few more hundred miles. Is there any chance of these cars burning while they sit with the battery disconnected and the key out?