Proton engines do vibrate a little, especially when the air-con + automatic gear engages, otherwise its fine. MYvi do not vibrate at all due to high RPM @ 1000 - 1100.

You only need to remember 1 thing, TPS voltage range 0.5 - 0.95, do not touch the TPS if you aren't sure about this.

You can screw up the air bleed, no problem; the effect is too high, too low or erratic idling, thats all.

For proper idling adjustment, just follow step 2 onwards.