89 Vette runs rough when restarted

My vette runs great when it's first started, gas mileage is good. When I shut it off, and restart it, it runs rough and has no power, and the gas mileage is cut in half.
We replaced the coil, and distributor cap, and same thing.
Lee
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Lee & Mary Ogden wrote:

<check engine> lite? Codes? Wiring/connector to O2 sensor? PJ
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