Ive had a problem with my mp3 player recently. After I turn my car off the cd would keep spinning and my headunit would remain lite.. im not even sure for how long. But it eventually turns off.. (btw ive fixed the problem)

Now im having sluggish startups with my car.. right when I turn the key to on itll hint me like its gonna die.. then boom itll start..

Is it the battery or could it be something else.

 

when's the last time you changed your sparkplugs?