I have a similar problem when making right turns on my '92 SSE */c and it only occurs when the fuel tank is less than 1/2 or 1/4 full. Mine stumbles under these conditions, but I always decelerate a little and wait a few seconds for engine power to return, so I don't know if it would stall if I were to accelerate when it stumbles. On my '92, the problem definitely has nothing to do with oil pressure or anything else - it'* absolutely related to the level of fuel in the tank. I know that because I drive the same route to work every day, and drive consistently, and the problem never happens when the fuel tank is 1/2 full or more.
Yes, there were several posts about similar problem(*) in the old posts, but nobody ever found a fix...
'99 Bonneville SLE, white, 112,000 miles
'02 Park Avenue Ultra, white diamond pearl, 88,000 miles