My 2000 buick lesabre stalls, had it to 2 machanics and neither can find the problem. Today I went out to start the car and I can smell gas and i watched the guage drop about an 1/8 of tank. any ideas what the problem can be.

The fastest way to check for the problem is to have a scanner hooked up to the obdii system and see which sensors change when you shift into drive.

92 Buick Lesabre Intermittant Stalling Problem - YouTube

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May 23, 2010 - Uploaded by Thechoice1products Check out the Buick Lesabre stalling problem and the solution that was found.

The 171 is an oxygen sensor code, you can look up

That alone is not the reason for stalling or idle issues

Year, Make, Model, and Engine Size?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

If the oil cap smells like gas, one of the injectors may be flooding the cylinder and the crankcase. That would not be a filter problem.
Check the spark plugs to see if they are wet.

What kind of Spark Plugs did you put in? If your answer is BOSCH Platinum? THROW THEM AWAY.

Put in AC DELCO.... that is your first thing to do..

I have the same problem few days ago, and still didn't find any solution. Can any one please help?????21

Multiple engine misfire is related to the coils and the ignition control module. I have a 2002 with the 3.8 engine. It has three coils. I just went through this problem. I bought one coil and tried it in each position with no improvement. It was the ignition control module. Mine is located under the three coils. A relatively easy item to replace. Cost about $140.

have the coils and control module tested, sounds like you lost a coil so it not firing on all cylinders, it puting gas into nexhaust thats the smell, have it checked asap so you dont damage converter, hope this helps.

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!