I know this has probably been discussed a thousand times but I can’t find what I am looking for specifically. I have a 97 SHO V8 of course I have had it for about two years now but it sat up for the last eighteen months mainly because I was out of the country. Anyway right before I stopped driving it the check engine light came on about the same time I noticed a whining noise when you start it up first thing in the morning. Well come to find out the CEL is P0411 Secondary air injection pump. I had a mechanic look at and he won’t give me a direct cost. So I would rather do it myself. Any advise?