My service engine has been comingon and off for about the last 5 days. I took it into the shop and they initially said it was just an optic something or other that was common on my model and year (2000 v6). Also when i was idoling my enigne would make a "waving" sound getting higher and lower.. possibly a belt problem? I know very little when it comes to cars and would really appreciate some ideas/help. Thanks alot:headscratch: