You may have a leaking fuel pressure regulator.
A Fuel Pressure Regulator is a simple mechanical device that holds constant fuel pressure or relieves excess fuel pressure by way of the pressure compressing an internal spring and opening an orifice back to the fuel pump.
Normally it is mounted on top of or near the TBI (injection) throttle bodies, on top of the injector, but if it's not visible there you will need to check a shop manual of follow the fuel line visually.
If it is mounted on the motor (not under the intake cover) you can remove a rubber hose and see if there's gas in the hose. If there is, the regulator has failed. The hose is only supposed to have air in it at all times.
A bad fuel regulator can allow gas to leak onto the ground or actually leak into the motor where it fouls the plugs.
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