Help! high rpm limp mode on drag car (track only)

I've got a 84 monte carlo that has a cam only ls1 and powerglide. Im using the shift light output to activate a relay for the shift solenoid on the shifter. and I use a launch controller set at 3800 when on the transbrake. The problem I'm having is if I try to shift above 6300 the car shuts down and wont clear unless I cycle the ignition. It doesn't shut off just idles. If you give it part throttle or full throttle it does the same thing, just surges. I can even make it do it sitting still and reving it up. But I don't like to do that in park with no load on it. I've gone through the DFCO tabs and cant find the problem. The car has been 6.89 shifting at 6300 but if I push 6400 it shuts down. And just will not operate normal until I cut it off and restart it..heres my file and some runs that I logged. A good pass and a pass where it shuts down