Originally Posted By: eljefino
Check the TPS. If it's flaky it will declare an opening slightly above idle and the computer won't think it needs to idle, so won't work the idle speed control motor until it's very late.
This could also include crummy grounds messing up computer readings when the engine rocks around during turns.
This, as an aging TPS(throttle position sensor) can cause a communication error between the throttle plate and ECM, and putting the steering in a bind could be highlighting the condition, causing the engine to stall. Odd that it only does it in one direction, but I've seen stranger things. Poor or corroded grounds can also cause loss of communication in the engine control harness. This usually manifest as backfiring and poor idling. You should have ECM harness grounds on the thermostat housing and front of intake. Also check your negative battery cable where it attaches to the engine.