I have a 97 mercury cougar V8 that recently started misfiring, since it started, I have replaced the spark plugs, the spark plug wires, and both ignition coils, each has helped, but has not completely gotten rid of the problem. I do not know what to do next. At this point, it is smooth in park, but the car rumbles and shakes when at a dead stop in gear, after I get going past 45 miles an hour, the car levels out, and as long as I do not stop competely, it stays level.
Nov 7, 2011 at 7:26 AM
