I have a '13 F350 deleted with a PSE tune. When pressing the accelerator I the truck builds boost then the boost drops and then comes back. I've included a video. The video is holding a steady throttle, the truck also does it just in park when I press the accelerator. PSE seems to think it's not the tune causing it.
https://picasaweb.google.com/lh/photo/m0S350PPBu7BI-aSqenbYtMTjNZETYmyPJy0liipFm0?feat=directlink
https://picasaweb.google.com/lh/photo/m0S350PPBu7BI-aSqenbYtMTjNZETYmyPJy0liipFm0?feat=directlink