you should wait more than 5 minutes when you're disconnecting your battery in order to reset your ecu. wait at least 10 minutes, then reconnect the battery, start the car, let it idle for another 5-6 minutes, then turn it back off, and then your car will be ready again when you turn it back on. whatever you do...DO NOT...hit the gas while your car is idling for those 5-6 minutes. other than that, it should be a piece of cake.