This will be my final post on this matter. I reset the computer as suggested by 2fast4u66. It seems to be working better the more it is driven now and my son is happy. I think that we drove it so long with a bad MAF that it did go into a limp mode and now the computer is readjusting itself. So I'm done for now and may replace the n75 valve this spring. Thank you all for your help and patience.