gafu mazda

OK guys...I take my car out every so often and at times i DO go WOT through 2nd,3rd,to 4th.The problem im having for some reason is that although my Rich/Lean gauge isnt going lean,the car feels like it is because it just stops going after certain amount of RPM(about 7-8,i dont usually look).It happens on 2nd and 3rd gear for the most part,like it hesitates.Any ideas?Im at 8 pounds of boost.Please let me know if you need any other info.Thanks in advance.