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You will need to get the fuel pressure checked. Sounds like either your fuel pump or pressure regulator is going bad.
Is there any further questions you may have on this problem?
I WILL CHECK THESE ANSWERS THANKS
THERE IS NO PRESSURE REGULATOR ON 87 ROLLS SILVER SPIRIT.
I HAVE BEEN STARTING THE CAR AND IT IDLES FINE LOW OR HIGH ACCELERATION, WHEN IN DRIVE IT MISSES. I DO NOT WANT TO CHANGE THE FUEL PUMP IF IT DOES NOT NEED ONE.