Are you programming with the handheld? If so you have to really watch the inputs. The handheld has a difficult time with finger commands and sometimes the input doesn't get taken. Use the stylus rather than your finger and you might have better results. Just be super careful when programming with the handheld because you can end up with really weird results due to miscommunication. You should probably buy the cable and hook up with a laptop if you're going to really tune a Sniper.

The other way to tune with a laptop is to just pop the SD card out of the handheld and put it into your desktop computer. Then you can edit the tune file with your desktop computer. Once you have it edited how you want you pop the SD carb back into the handheld and upload the new tune to your Sniper.