I was driving my car earlier today and noticed my temp guage fluxuating. Going up and down slowly. I thought maybe it had something to do with my Mugen radiator cap so I changed it back to my stock one. Seemed better, but then it started doing it again. Could it be because I'm still running the stock radiator? I plan on replacing it soon, but I don't want to spend all that money now, and the problem be the water pump or thermostat or something... Thanks for all your guys help!!!!