you will need to tell us what the code it before anybody can do much of anything.

yes, you could go into great detail about what you think is wrong, how u think its running bad, or what your friends think, but thats all a waste of time.

go to autozone and get them to check it for free, or go on google, look up the paper clip trick to get a CEL/MIL code, and tell us what it is.