2002-2005 Ford Thunderbird and Lincoln LS have a widely known issue with Ignition coils going bad and also fouling out spark plugs causing misfires . Just by replacing these components you may be able to bring new life to your engine! At the time of this post, 35.99 for an entire set of Ignition Coils! Can't beat that! If you have a 2002-2005 Ford Thunderbird I would buy these just to have on hand because of the history of these going bad! Don't forget to order 8 spark plugs too because the coils foul them out! Here is the link http://amzn.to/2ilnIo3 There is a post here on how to replace or here.