Help with engine problem

[Yaw]

So my engine is idling pretty rough sounding like it’s basically going to shut off but doesn’t, still drives but I don’t want to drive it the way it is but atm it’s my only source of transport has this happened to anyone else randomly haven’t changed anything, I can upload a video later, it’s just a regular RB30 N/A

 

[lmoengnr]

It might be your Idle Air Control valve clagged up with carbon, and stuck in the base idle position.

 

[Yaw]

Would you have any idea how I’d check that and how much it’d cost? Thank you for the reply

 

[chrisp]

Just as a general suggestion, pop the bonnet when it is dark and see if there is any arcing from and ignition leads, the coil or distributor.