Hi I have had a couple of engine warning lights when I have had a lazy start up , my battery gets low and sometimes only just fires up, We have a lumpy tick over then after a couple of mins we are good to go. My inde recons I could have a damage coil pack and best to get them changed, I just wonder how easy a job is it to change or is it a hold your tounge scrape your knuckles "GOD I WISH I HADNT STARTED THIS" , type of job !!! :?: