Asking a used car dealer to change a part on a Buick before buying car?

by rabble
Question by holacarinados: Asking a used car dealer to change a part on a Buick before buying car?
I'm thinking of buying a 1996 Buick LeSabre with a 3800 engine I saw and drove at a dealer, who is also a new car dealer. However, I read the engine has a problem with the intake manifold because it's made partly of plastic and tends to burn out and ruin up the engine. This car has less than 46,000 miles on it, and the engine is fine at this point. I ran a carfax report on it, and it

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