To get an idea of what and where your trouble may be Autozone offers a troubleshooting guide. Find out what's wrong with your car using their troubleshooting guide. All you need to know is what the problem feels like, looks like, smells like or sounds like.
http://www.autozone.com/UseCase,S001/Us ... heZone.htm
It may not be the best but it might get you in the right vicinity.