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Q: my fuel pressure is 40 to 37 will this cause car to back fire when pushing on gas. on 1993 Pontiac Firebird

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idles good can not drive start to back fire when you increase engine speed.
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No, this is adequate fuel pressure. This sounds more like an air flow meter, ignition timing or something else. Are there any fault codes stored?
I can not get them from the car , grounding the terminal it does nothing and i do not have anything to read them. I think maybe a coil if you pull them off and check ohms across the terminal on the mounting plate i get ohms on two of them and zero on the third. Should i not be getting zero across all three ?