p38 diesel with a problem

hi guys
i'd like to firstly introduce myself. My name is Mark and i live near Belfast.
I only bought my 1st range rover in march this year and was really happy with it up until maybe a month ago when it developed a wee fault.
The car is a 2000 model, 2.5td. More often than not it idles at 1200rpm. Sometimes it also runs a bit rough but this will clear with a rev. When it runs rough like this it also gives out black smoke.
My local dealer said it was the air flow meter, but couldnt supply 1, so i bought a 2nd hand 1 of ebay. It made no difference.

any advice wud be greatly appreciated
Cheers
Mark

First of all get yourself into the Range Rover section, that's where you'll find the experts.

Oh sorry, welcome, now go ask your question in the Range Rover section.

Bye the way, it should tick over at about 750rpm.

Have you serviced it? filters etc ?

ok no bother
I'm also new to computers and forums
I'll post now on the range rover section

cheers