The fast idle works just fine, but when the car warms up the rpms drop below 500 and the engine stalls. What is the best way to turn the normal idle up. I see in the manual info. on fuel mixture and var. resistor, but I don't want to mess things up worse.

 

Well, one fix that is easy to do and is gauranteed to raise your idle is the throttle stop screw Pretty hard to describe it but it is a set screw on the firewall side of the TB (Turbo version, front side NA). It is really small and is where the throttle rod has an attachment that hits this little screw which opens the throttle more. It has an 8mm nut on the other side of it to stop it from backing out.

Hope this helps