Front end help?

[Mike Taylor 3601]

I have named this "death wobble" on my G body malibu,first happened at northern class nationals,when cross finish line shove clutch in and knock out of gear,then front end start shaking so bad can't hold on to steering wheel,brakes make it worse, I tried man handling steer wheel,that didn't go good,tried stabbing brakes,tried lightly braking, nothing helps,except when speed get down to probaly 25-30 mph it quits,
Found out yesterday that speed doesn't start it,1st round of bracket yesterday at doorslammers I flickered the stage bulb and was red when tree started,so just drove down track maybe 45- 50 mph @ finish line and let off throttle and it went in to wobble?
I don't know if is shocks bad, something out of line,have to fix, it shakes so hard,I am going to check if not replace all front end components,it gets so violent I'm scared could have damaged something

One thing confuses me is it doesn't do it everytime.

Mike Taylor 3601