Is that a fairly common fault and the most likely possibility?

For give my technical ignorance but what is a MAF?

Hello, I have a 2006 Freelander TD4 which has started occasionally to splutter just once every now and again. Also, when I start the engine from warm, it seems to tick over just below where it normally does but rights itself after about 30-60 seconds. In this time though it seems to lack a...