Hi Trevor,
Thanks for answering so quickly, I have thought about a remap and I have had the exhaust changed to a less restrictive system. I have been told that there are no sensors that can pick up a faulty air meter, which is why I asked the question, how long do they last. I agree that a cold air intake system could be of benefit. Thank you for for all the information, I will let you know how I get on.
Richard