Update: It turned out to be water in the gasoline! Makes sense. It takes some driving before the water swishes around in the tank to mix with the gas, which is exactly what I observed.
Water doesn't mix with the gasoline.
SOURCE: 1996 Camry 100 km stalling
You have one of two very common problems.
Number one may be a stuck open EGR valve
Number two would be a failing Idle Air Control valve (IAC).
Try this: Open the hood & locate the EGR valve, close to the firewall, behind the intake. Find & take with you a small hammer. The next time that it happens, open the hood & tap on the EGR valve. If it is sticking "open" the tapping may dislodge the carbon particles that are keeping it open.When the EGR valve is open, exhaust is getting into the intake at idle, and this will def stall out the car.
There is no repair to the IAC valve, it would need to be replaced if it is bad.
One of these two scenarios will cure your problem, I see it every day.
SOURCE: 2000 buick lesabre stall after starting or after running for 30 minutes
I have a 1996 Lesabre. I had a similar problem that slowly got worse. I brought it to two different mechanics that did diagnostic checks and could only "suggest" what to replace to fix the problem. Their problem was that it wouldnt stall out while they had the mv. After replacing a bunch of sensors and the fuel pump/ filter, I solved the problem by replacing the Crank Sensor. Its located behind the lower crank pulley on the 3.8 lt motor. Hope this helps!
SOURCE: URGENT - 1994 Buick LeSabre stalls in mid-ride
I have the same vehicle, and had the same problem. I took it to my mechanic, and after all of the codes were read we replaced the Ignition Control Module, then the Crankshaft Position Sensor.
It runs just fine now.
Best bet would be to have someone hook up the code reader. The car will tell you what it needs(not specifically, but it'll tell you where to look).
Good luck!!!
Kindest Regards,
Ollie
SOURCE: 1997 buick Lesabre studers when driving over 50
Sounds like what is called shutter changing to synthetic fluid fixed my 98 Lesabre
SOURCE: Car stalling and will turn over but not restart right away
check the key my sure the programme is still good
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