Had this happen to me on an 03 Aero SS. It spent a few weeks jumping up and down until eventually it stopped working altogether. In the interest of saving money I dropped the tank and cleaned the level sender and resoldered the wires. Put it back together and no difference. Tank had to come down AGAIN and I replaced the whole pump and sender unit. Works fine now. I'd recommend just replacing the lot as it's not a quick job getting it out.
You will need to replace the sending unit, that is really the only thing that will cause this issue
You could use two resistors, Two different ohms specs for full and empty. Place resistor between proper wire colors in diagram. Turn on the key, If gage reacts properly to full and empty resistors, then I think the problem is the sending unit in gas tank. If not, the problem could be almost anywhere, wiring circuit--pcm--instrument cluster. I did see trouble codes relating to fuel gage sending unit. I hesitate to get into that? good luck
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