Nalin Weerakoon

Need advice Pls The engine vibrating and stops running when the air-condition is switched on. The EFI unit and the AC unit was fully serviced due the reason but still the engine gives trouble, at present the engine runs on a high idle 1500rpm when the AC is switched on it drops to 800rpm, The vehicle was running on gas by the previous owner and it had a back fire according to the experts the air distribution sensor was affected by this and should be replaced other experts say it’s a problem with the idle up unit Help Needed 1.Need a expert to inspect the vehicle and advice 2.Need to purchase the Air flow sensor and the idle up unit/sensor