My KE70 has developed an idle problem. I drained the battery completely dead last week which was my own stupid fault and after replacing it, the car starts and unless I rev it, it idles pretty lumpy and the dies after 3 - 5 seconds. I'm pretty sure it's got nothing to do with my choke and I don't know what it could be. I was thinking it might be because the old owner filled it up with premium and I don't? Anyone got a clue? Help much appreciated.