Welcome, doing search can be hard but just go back and read old topics such as not running , running rough etc..you will need a scan tool first thing no if ands or buts.
Welcome! First and foremost if you don't already have one as was stated make sure you have some sort of scan tool so that you are not running around blind. Definitely check out the link that John posted for the "Spring Cleaning" and the search engine on here can also be very helpful or when in doubt ask away in the General Tech area as there are plenty of knowledgeable folks that can help. Another idea is if you tell us where you are located you might be able to find someone locally that can take a look at the car and give you a hand.