Don't think yours will have a MAP sensor. It will have a MAF sensor, and it is attached to the air filter housing.
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When I had that problem on my 1997 buick lesabre, I had to replace the catalyst converter and the 02 sensor on it. It resolved the issue with the code.
It was $150 at the dealership where I bought the car. $240 to replace it with tax and labor.
Check www.autozone.com, they have a Repair Info section that covers Buick LeSabre with this info.
what actuator?
Remove belt, balancer bolt and get a balancer puller to remove the balancer. Unbolt and unplug sensor to replace it. An air impact wrench that is strong will get the bolt loose.