96 NA manual 300zx (fuel issue?)

[07mike07]

Yesterday I drove the car out with hope it would do something different and give me a sign due to me not being able to drive past 2k rpms and the car bogging down to 1k rpms when I hit about 2.2k rpms.

when I took off same thing was occuring, then I parked and started it back up a couple minutes later and then the car starts driving fine, goes past 2k rpms and everything. I've now noticed the car drives fine when low on gas or atleast when my gauge reads low on gas but as soon as I put gas in it the issue starts again until I can manage to get it low on gas. I have no clue what could cause that. Maybe a bad pump? Maybe a bad sending unit? I've also noticed that on the level side of the tank, the floater is missing on one of the metal pieces, I don't know if that has anything to do with it.