Help!! I have a 2000 Kia Sephia that when I start it up even in park I can got get the RPMs to hit 1000 when pushing the gas. It started out just not wanting to accelerate when I went from a stop to moving after sitting for a few hours and would do the same thing when I stopped at a light. Now it will not accelerate at all. I have replaced the spark plugs, plug wires, trans filter & fluid, mass air flow sensor and don't know what else to check. I tried to take it to an auto part store to have a codes ran on it but they refused cause the check engine light was not on.