I have a similar issue in a 8 series.
If you death head it or lock the wheel the truck surges at times and will stall randomly.
We have replaced the vacuum chamber at the vaporizer and some one installed a new vaporizer also. We have tried the adjust the mix and it's at 2.5 and the 02 cycles normally.
We went as far to Install a new distributor and still doing the same thing. Other then a ecm not sure what else controls the compensates load.
Thank you.