The firing order of a 1992 Buick Regal V6 3.8 is 1-6-5-4-3-2
The 3.8 litre V6 engine in a 1992 Buick LeSabre has a timing CHAIN
Yest, the Buick LeSabre from 1992-1994 is the same exact car, inside, outside, underside. Everything is identical, except say for the trim packages and options you get on them. Therefore, yes the cassette radio from a 1992 LeSabre will work in a 1994 LeSabre.
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A 1992 LeSabre wouldn't have a valet switch
Yes, the 1992 Buick LeSabre does have driver side air bags. the air bags were standard in all the Buick cars that year.
Custom is lower end. Limited has more features.
No it does not.