At times it runs perfect. Other times it does this. When coming to a stop I push the clutch in and the rpms shoot up to 15 to 1600 and will stay or at times it comes back down to the normal 750. I can also be sitting at a red light idle will be normal then all of a sudden the rpms shoot up to 1500 or so and it might stay there or it might come back down. I'm affraid it might be my IAC valve sticking or something. Is this possible? Please help!!!!!!