When my car is at idle, the heat gauge is normal and I have adequate heat. As soon as I drive a few miles the gauge drops below the low line and the heat is almost non existent... help! (as you see it's a 92 which means I need to fix this myself if possible cause I am economically challenged at the moment)

Depending upon where you live, this link may give you an idea that will help minimize the effect of winter cooling:

https://www.askmehelpdesk.com/cars-t...tml#post262690

Also, flush out the heater core if you suspect there may be corrosion or other blockage. A faulty thermostat can also cause overcooling. Ensure the control valve and blender door operates properly.