I had the exact same prob, for my satria either the rpm will be at 2 when start or below one, if i on the aircond then it's worst, well
-first just service the TB kit - will cost u like RM50 - 60, i did mine, worked like for one week then the prob came back,
- clean the whole TB (service) still same
- last option change the bloody thing (TB), now ok, car is stable and better pickup and smooth. cost me about RM250 (potong kereta, foreman price)
so u might wanna try to cheapest alternative then work ur way up.....