stalling, check engine light flashing on 2002 Chevrolet S10

sometimes stalls at lights.When coming down a hill I downshift (auto trans) and dynamic brake and engine light comes on flashing switching to OD shuts off light .The same thing happens if I leave shifter in drive not OD . I have replaced coil,plugs.plug wires and crank sensor.

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1 answer
You should have it diagnosed. Lack of spark, fuel, timing or compression will cause a misfire (check engine light flashing).