My manual ralliart magna keeps stalling when the car is sitting in neutral, It doesn't do it all the time, but sometimes just decides it doesn't want to idle anymore. It's happened once before when I disconnected and reconnected the battery, but it fixed itself after a small time, this time it isn't fixing itself.

Has anyone got any ideas?

Idle Speed Control (ISC) motor.

Anyway you can "DIY" adjust/fix it? or would I have to take it to a mechanic?

Dying Battery.
Does is also occasionally stall as soon as you start it, then start and run fine on the second attempt?
This is what my car did as well as stalling at traffic lights for no reason.
Classic signs of a dying battery in the Magna.

Anyway you can "DIY" adjust/fix it? or would I have to take it to a mechanic?

Search for "ISC" on this forum and see if the symptoms fit. Easy job to replace it, once you know where it is and what it does. lol

Always starts up first go. Couldn't find anything when searching for "ISC" :/ Well, hopefully that's all it is :D

Thanks for all your help so far guys :)

Search for "Idle speed control motor" and you get lots of threads. I did!

Thanks for your help MadMax, appreciate it