A few months ago I came onto this forum to ask about my '99 Deville...it was running rough when started up and seemed to have a miss when stopped at a light. Some of you suggested changing the spark plugs along with the wires. Some mentioned cleaning the throttle body. Well I got around to having both done and it runs great...no roughness, no missing. I just wanted to come back on and say "Thanks" for your guidance and help in the matter. You folks were a great help to me and it's very much appreciated. Kindest regards.