I have a Lexus RX300 '01 and over the course of about 2 months, it will periodically not want to start. It's getting power, but it's not wanting to turn over. If I give it gas and get the RPMs up, it will eventually start. The first time it happened, I figured it was bad gas, but it continues to happen once every couple of weeks. There are no check engine lights or dashboard lights coming on. Any ideas of what could be the problem? Lexus Dealership can't diagnose it unless there is a check engine light. Thank you!!