I bought it about a year ago, and have never had a full tune up on it, only had the oil changed a couple times, should i pay to have it tuned up? (not sure what all is included in a tune up) im just a poor college student and would like to avoid spending money where i can, is it worth it, should i have a tune up done? Not sure when the last time it was tuned up either. Any Advice would be awsome