Land Rover Repair: Land Rover Disco II, air suspension, john robinson

Question
When I started my vehicle this morning I noticed it was puttering almost like its not running on all 8. Every time I take it to the dealer it seems to cost so much im just curious as to what it is and how much this time? If its only plugs and wires I will do it my self and save the money. Any advice would be greatly appreciated.

Answer
My specialty is the air suspension, I will try, but John Robinson can give you a much better answer.

I agree the dealer is over-priced.  Depending on mileage it could be the plugs/wires.  It's one of the easier jobs to do on a LR, so definitely DIY.  Plus, the more you work on your Disco, the more you learn about it.