Not Ranked
First off are you running an electric pump or the mechanical one? If it is an electric one, you should be able to hear it running and if the pressure is varying that much, be sure your fuel filter is not full of crap. Then if you have a pressure regulator check it and the gage to be sure they are ok. You can also remove the gas line at a convenient place and turn the pump on and see if you get gas coming out at a good rate. A bad gage wouldn't cause the car to run bad, but a bad regulator or filter that is blocked would.
Ron
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