Will my 99 lesabre engine fit in my 2002 lesabre?

Yes and no... Will it fit. Yes. Same sensors and connectors. No

Will a 2000 /3800 fit in a 2002

As long as it has the same vin label. The cars should have the 3800 series 2 in them. Motor is almost bullet proof.

I have a 1999 buick lesebra custom im trying to take the motor and transmission out and drop it in a 2002 Buick regal will it work and function right

Will a 1999 Buick century motor fit a 2002 Buick park Avenue