Ok, in about the past week ive notice about 1 in 8 times when i come to a stoplight and im idling the rpm needle is kind of jumping. I got kinda nervous because i didnt know what the hell was wrong. Is this bad?? Is there anything i can do for it? should i take it into a mechanic asap?? i need some advice. the rpms jump from about 500 to 1000 but as i said it only does it sometimes.