Hi, just reading this thread as I have had similar problems. MY performance is now in the 15secs range 2-3K 5th, but it took a new MAF even though there was not that much differnece when the old one was disconnected. I got one for £30 on ebay if you are interested. It was easy to fit. I do still have slowish performance below 2k off the mark so I think I will try to clean the EGR thing next, just as soon as I find out what and where it is!
Cheers
Cheers