My car shows zero data at all times and the little box never turns green. 2000 Chev Monte Carlo SS, with all PIDs and formulas for KR.

I scanned a '04 GTP today and had some weird results. At idle it reads anywhere from 4.5-12.5 KR on the graph, but the digital display stayed stuck on what ever the graph showed when you page over to it and the little box never turns green. Again this is with all PIDs and formulas.