this happend a while ago, the dealer replaced the cat and the plugs saying they fixed it. 1 month later, it does ita gain. When coming to a stop the car will stall. It doesnt start right back up though, it takes roughly 1 minuted before it will start again. If you do not give it any gas or anything it will stall back out, if you do then it will run for a while and then stall back out when stopping (not every time I stop, but out of the drive home, 3 out of 5 times it stalled. I did a search on the coils and didnt really see anyone having this issue. They all said they had trouble starting it and stuff which this one starts every time, but it does take a little longer then what I feel it shoudl take. I already replaced the battery so its not stock, the car is an 04 automatic with 55k miles on it. Im not sure if its original coils or not..