I have read a lot of topic on this issues but there were virtually no information on how to cure this problem; ERRATIC IDLING on Proton fuel injection cars.

I own a Wira 1.6XLI Auto and Waja 1.6 Auto.

The Wira have been giving me problems since 2004 when the original Throttle Body fails.
So I have the servo kit changed (2 times in fact); but no good at all.
Proton sell the Throttle Body unit for RM 1200+, so I get a re-cond unit at RM580; but still no good.
Same result as changing the servo kit.

I am an ex-mechanic myself, so I went on a learning spree about fuel injection cars.

Tried reset ECU by taking off battery for 30 minutes, went to workshop for diagnostic reset error code and troubleshoot; every thing is fine; but idling still erratic, especially when air-con kicks in or turning the steering while parking or making a turn.

I've eventually solved the problem... literally!

Here is what you need;

1) flat or Phillips screw driver
2) or no. 8 spanner
3) digital volt meter (must be digital)

Firstly, check the followings;

1) timing set to 12° BTDC (variable range is 8° - 18°) you can set to proper value after adjustment depending on the fuel U use
2) make sure TB Servo is working properly (hot start engine should rev above 1000RPM then drop below that after a couple of seconds)

MUST;
a) set to proper timing of 12° BTDC if not done
b) if TB Servo not working, have it changed

Without meeting a) & b) requirements, this adjustment procedure won't work.

After that, here is the easy part;

1) Start your engine or turn car key to ON position
    - measure TPS (Throttle Position Sensor) the 2 green terminals
    - variable range must be between 0.5 - 0.95 volts, U try which value is suitable for your car, mind is 0.5 - 0.6 (nice & stable)
2) Turn OFF engine, make sure car key is in OFF position
    - turn the air bleed screw all the way clockwise until it locks, not tight - just lock
3) Start the engine & let it run for a minute or so
    - engine should open the idle servo to compensate for the lack of air
    - engine should automatically rev to >1000RPM then steadily drop to 600/700RPM
4) Engine still running after 1 minute (take your time, let the engine figure out what to do)
    - turn air bleed screw 1 full turn anti-clockwise
    - engine should again rev >1000RPM then drop to 700RPM or so
5) Let it run a minute or so again
    - now ON air-con
    - engine should react immediately to the extra load
    - ON & OFF air-con a couple of times between intervals of 30 second or so
6) You may turn the air bleed anti-clockwise more, if air-con idle too low
    - range is usually 1 - 2.5 turns anti-clockwise

* You are done

My Wira now accelerates better, more immediate and less smoke due to rich idle, engine runs cooler too.
Previously it chokes & accelerate like a diesel vehicle, vibrates during idle; now no more that.

You guys enjoy. Proton car is such a fuzz.

check for any vacuum leaks at ur throttle body and intake manifold... check for vacuum line leaks as well...
check cam timing if its correct during timing belt installation...