I have a problem with my 1986 honda 200sx. It idles good, but for some reason ittle start revving high. It also drives by itslef when it does that. It also wastes a lot if gas, but im more worried about the iding issue. I have the idle low right now so it wouldnt do that, but when i fix the idle, it idles good, but itll start revving up. Please help me