1997 Mazda 929

Engine problem
1997 Mazda 929 6 cyl Four Wheel Drive Automatic 171000 miles

I test drove this vehicle and when I got to about 60+ mph the engine begin to skip and shake some.
The dealer put the car in the shop and he said there was a spark plug with a hairline crack in it and that was the problem. Before I buy the vehicle, could this be true?

By the way, it is a 97 Mazda Millenia. I selected 929 b/c there was no other option close to the Millenia.
January 23, 2008.

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