91 toyota pickup v6 stalls in drive and when wheels turn left. Out of ideas

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This problem has been going on for about 6 months now. Its been at the shop for the last few months and they couldnt figure it out. It started by sputtering and sometimes dying at stop lights. Then started stalling if you hit the brakes too hard. Sometimes after stalling it would take a minute to start and when it did a substantial amout of black smoke would come out of the exhaust indicating flooding/ richness. So i started replacing parts based on recommondations from other mechanics. New: fuel pressure regulator, plugs and wires, distributor assembly, fuel pump, egr valve, throttle position sensor, pcv valve along with intake plennum gasket, ive gone through all the vacuum lines and replaced quite a few. So now it will start up fine and idle great. It will run all day in park, reverse, ant neutral, but stalls as soon as you put it in drive. You can turn the wheels all the way right and back to center, but as soon as you turn the wheels left past center, it chokes out. It will also stall sometimes by just pressing the brake, with the brake booster vacuum line unhooked, it wont stall, so im assuming the booster is leaking somewhere. The power steering is also vaccum assisted, ive taken off and plugged up the two vacuum lines going into the control unit on the ps pump, and it still stalls when turning left. Im out of ideas. Thank you for reading. _mike