As long as you fix the lack of fuel pressure, the misfire should take care of itself. If it is misfiring, you’ll likely get P0300 (random misfire, all cylinders) along with the P0087 that brought you here. Misfire– Without enough fuel pressure, your Grand Marquis is likely to misfire.It usually feels like it falls flat on its face, or just runs out of go.
The most common ones are running at highway speeds and hard acceleration. This happens in situations where you need a lot of fuel pressure.
Low Power– If the fuel pressure is too low, it will not allow the vehicle to operate above a certain performance threshold. Here are the most common symptoms of P0087 that you may be experiencing in your Grand Marquis. How bad those issues are going to be depends on whether the fuel pressure is staying consistently low, or if it’s fluctuating in and out of normal operating range. If your Grand Marquis is experiencing P0087, it is almost always going to be accompanied by drivability issues. This means that the fuel pump adjusts the pressure going to the fuel rail based on the demands of the vehicle, therefore eliminating the need for a return line. This code is most common on vehicles that use a returnless fuel system. It’s generic, which means that it has the same meaning for the Mercury Grand Marquis as it would any other vehicle. This code indicates that there is an issue with getting enough fuel pressure to the fuel rails. 
P0087 is a relatively common OBD II trouble code.
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