2001 buick lesabre intermitenly shuts off while driving. it sometimes comes up with map circuits low output, and sometimes maf circuit low. also the security lite sometimes does not go off. looked at map and maf sensors with scan tool, both are stable.

Change the crank sensor,they fail so often on this model,they should be changed with every spark plug change as part of a tune up.If yours has never been changed,you need to anyway to keep your car reliable.Cheap and easy to change.

Sounds like a battery or charging system problem. Get the battery tested as it may not be able to charge all the way up. If the altenator is having a rectifver problem it could be adding AC current to the information bus and could be fooling the computer and making the rpm sense wrong so it turns the idel all the way down. Sometimes the EGR valve can have a piece of carbon stuck in it making a vacume leak or and other vacume leak. The crankshaft senser can be dropping out and can be hard to catch with the scanner hooked up have someone drive the car and you watch the scanner watching the data stream. Low coolant and the senser coming into and out of the water makes them do this too. A bad therostate or coolant problems ( exhaust in the coolant) ( bubbles from leaking water pump ) does the same thing. Go though the security reset procedure as the scanner recommends. Run though the tests that the scanner will do you can have it not pass a test for anything fix that and your problem is fixed too.