Hi all. am am hopefully about to purchase a 2007 Land Rover Range Rover Sport 3.6 TD V8 HSE 5dr. took it for a test drive today and loved it. it did chuck out a bit of black smoke when i pulled away but it has been standing for a while and my x5 was like that until i gave it a good run. also when i parked up to have a look with the engine running i noticed the air suspension was making the odd small his around the car. is this normal as i got and it was adjusting its self? any thing else i should for?