I drive a 2002 Taurus with 128,000 miles on it. It s not a great car and since I am a college student I don t have that much money to spend on it. The car idles rough when had the coded checked there was a misfire on cylinders 1 and 5. I replaced all the spark plugs since I had recently bought the car and wanted to be safe. The check engine light went off but soon returned and the rough idle is getting worse. Now after idling about 20 seconds you can feel an abrupt change in the idle and it gets rougher than before, the check engine light also starts to flash. then it is difficult to accelerate for the first few seconds then goes back to normal and the flashing stops. I recently saved up enough money to change the ignition coil and plug wires although I changed the plugs almost 2 months ago. I also ran sea foam engine cleaner through a whole tank of gas. The check engine light again went off but as soon as I idled for an extended period the problem started again. Could the plugs have gone bad because of the bad wires and need to be replaced again, if not what else could it be