Hello. I have a 1992 300ZX NA and I seem to have a problem with my car. I pumped gas and the gauge was at 3/4 full before the problem happened. When I was driving my car today, the fuel gauge decided to go down for some reason. The gauge needle was intermittent, going up and down. Every time I made a full stop, the needle would fluctuate and start going down slowly. Right now, it's between 1/2 and 1/4. The fuel gauge does not want to read the amount of fuel I have. Anyone happen to know what's wrong with my car? Thanks