So for the past few weeks now my car seems to have no power...it hesitates when i lay into the gas. It seems like it gets louder, but my rpms barely climb and i dont go a whole lot faster. It seems like there is no power up to 4k, and when it finally does start to pick up its not like it was. I recently changed the fuel filter which was a little clogged, but still running clear, I cleaned my throttle body ( which was practically spotless to begin with ) and cleaned my air filter. The car just seems to have no power to it anymore...could it be the clutch slipping? Anything else I should check into?