This might sound odd, but I'm just going to chime in here. My coolant sensor was going bad (actually wires running to the plug). With that the Z would always run rich (PCM thinks its still cold so pumps more fuel to warm it up). So after re-splicing the harness and putting in a new sensor and plug it reads properly and when I give it has while parked in park or mutual it doesn't stall or cut off anymore. Not sure if that's your exact problem just thought it might be a bit of knowledge for ya.
Got it stuck. It's still stuck. It's so stuck I could call insurance and say it was stolen and no one would ever know. It's so stuck I don't know anyone with a capable enough 4x4 to even to to where I got stuck to winch or yank me out.