gas gauge flutters on 2002 Chevrolet S10

it seems it correct itself after you start driving

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1 answer
Got a 2000 Blazer, normal operation but i dont like it! Go down hill or hit the brakes goes from 1/4 to empty. Nothing you can do but drive it and on level ground it will read correctly. Even the replacement modules do the same thing. Not just S10 but GM.