2001 Range Rover 4.6 HSE miss in motor

[Larry038]

I am having problems with my rover. It has a bad miss and my fuel milage is bad even for a rover. The scan gave me these two codes 1412 exhaust gas recirculation valve frozen and 1415 air pump circuit, also got a random misfire on cylinder 5. I have new wires and plugs installed less that 2 weeks ago and also have new cats installed because the passenger side cat was clogged up. Can you give me any advice on what I should do to fix my rover. This is my first rover and im unfamiliar with the 4.6 engine. Its doesnt seem to be the same as an American engine or at least some of the parts arent. Any help at all woulld be greatly appreciated. Thanks Larry