4A-GE idle problem

Ever since I had the 4A-GE engine installed in the Toyota Corolla KE-35 Hardtop, I have this problem where the car would stall at the traffic light when the air conditioner was switched on. Went to the workshop in and out quite a few times just to fix it and it finally got fixed today. No more trouble with the engine stalling at the traffic light! Wasn't the current from the battery, wasn't because of the ECU setting, throttle body serviced and still had the problem. So in the end, took it to this person that does air conditioners in Sunway industrial area, the shop is called YS Auto Air Cond & Car Care, by the side of Sunway University College next to a small Restaurant called Lunch Box. He installed a FICD which controls the idle RPM when the air conditioner is switched on by increasing the vacuum suction of air into the throttle body. Morning starts the engine would idle at 1500rpm, and without the aircond at the traffic light, it would idle around 1000rpm. Once the air conditioner was switched on the rpm would drop to about 500 and the engine dies. Now with the FICD, with the air conditioner running, the idle rpm is around 800-1100 rpm. Costs me about RM75.00, way much cheaper than buying a new throttle body. He also hooked up my Stereo system and now driving the Toyota Corolla is even better than before. Now all I need are 2 bucket seats, a better roof lining, some old skool 13s, some new cams, a new steering wheel and most importantly two 4 point seat belts.