I am working on tuning my 2006 V8 trailblazer using HP tuners. I am using an AEM wideband that I brought in through the A/C pressure switch. I have created Histograms that display % of error for both the VE table and the MAF frequency both low and high range. All of my histograms seem to display correctly. I have a % error both + and - calculating correctly in the tables. The problem I am having is that I cannot copy and paste special either the High or low Histograms for the MAF frequency. The one for the VE works fine, but when I try to copy and paste special for the MAF frequency absolutely nothing happens. No changes are made to the values in the table I am trying to adjust. This leaves me having to do each cell manually, which is just more work. Any suggestions as to what I am missing here or did wrong? Thanks, Roy