I am planning to clean the throttle body on the weekend to try to get rid of a slight shake at idle with the air con off.

Plugs has been recently changed, and I don't think its the ignition coils as the car revs quickly and smoothly to redline.

Its only a little rough on idle. If the throttle body needs to be clean, maybe I should do a catch can setup?

 

Try cleaning the MAF sensor.

Someone posted this link a few weeks back. An easy DIY!

MAF Sensor Cleaning

 

excellent thanks will do.

 

it's probably your engine mounts. common problem on the 430.

 

I cleaned out the throttle body as well as the MAP sensor, it now 98% smooth on idle. The throttle body was a little dirty but the last mechanic who put in the air filter forgot to properly clamp the air box to the flexi inlet tube. This could be why slight shake at idle.

The other 2% could be the engine mounts (as noted by Liquid SC) which I'll have a look on the weekend.

I'll happy that the engine is so smooth. I'm wrapped!!!