I was driving over a mountain pass and tried to pass a semi when my rpm meter started going back and forth very quickly when I went past 4000rpm. Im hoping it's not an extremely big issue because the car runs normally until it gets over the rpm. Both my check engine light and maintenance required lights are on but they've been turning off and on for months now and nothing's happened before. I hope that last sentence didn't make me look like too much of an idiot, if anyone could lend me some insight then that'd be great