1999 Chevy Silverado 2500 / engine 6.0

I have a problem with my chevy. The fuel gauge is acting strange, I start the vehicle and the gauge goes to full and then to empty. I turn it off and on again and that doesn't work. I tried rolling back and stepping on the brakes to rock it and that doesn't work. Sometimes I move the autoshifter to drive and back and it seems to work every once in a while. When I start driving it will move and in a while get up to where it's suppose to be. I don't know if it is the sending unit or a lose ground wire or what.


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