Finally fixed my Contour. The engine idle RPM was jumping up and down, and sometimes stalling. I would have to put the car in neutral and rev it up at every red light. I dealt with this for months. So I finally replaced the spark plugs, wires, and O2 sensors and cleaned the MAF sensor. That did nothing, but it gained a few MPG. So I thought it was a vacuum leak or the IAC valve. So I got a smoke machine and smoked the intake and found the upper intake manifold gasket leaking, and the IAC leaking but I think it has a vent that is supposed to leak. I took off the upper intake manifold. Everything had a pretty nasty coating of carbon buildup. I assume this is from running too rich for so long? I didn't want to disassemble the motor any further, so I just cleaned what I could on the upper near the throttle body. I replaced the upper intake gasket, IAC, EGR, and PCV. Started it up and finally it's fixed!!! It runs perfectly. Bonus, the check engine light went out after being on for years. But the coolant light is still on, whats up with that? Anyway, I'm wondering about the idle adjustment screw on the bottom of the throttle body. I took the screw all the way out clean inside. And I don't remember how far it was in, or how where to put it now. But the car runs great.