Check Engine Update-960
 

So the check engine light is still on, and I can't find out what gives. That said, I still feel like something's about to go wrong on the car; when I back out of a parking space, I hear this squealing from the wheels, and the accelerator feels a bit loose. Is this something I can fix myself or do I need to take it to a mechanic? I have to drive out of town, and need a quick and cheap fix ASAP. Thanks!