sensor problem? on 1993 Dodge Caravan

Qualified mechanic told me that I had to have a diagnostic done on my Caravan LE to see which sensor is going.

Problem: Van wants to continue going when I stop. It doesn't happen all the time. Motor's in great shape; burns no oil. Tranny almost new.
Mechanic said there are three sensors, from $150 to $500 to repair. The 02 seems suspect? Is the costs accurate? I'm on tight budget. Any help appreciated.

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