Performance

Asked by GRAND98 Jul 27, 2019 at 01:02 AM about the 1998 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

Im going up on ramp to highway getting up to
speed 75 and suddenly im slowing down ,but rpm
is still going up ?? And cant seem to kick it back
up.

3 Answers
3,655

Randy answered 4 years ago

It is possible that the gas pump is going out. When it does this you don't get near the pressure at the rail that you used to. I just had this issue in my pick up couple years ago. It sputtered going uphill but is fine downhill. Because it doesn't have to work as hard downhill.. force of gravity.

Mark helpful

GRAND98 answered 4 years ago

Thats a gd thought,thanks randy. Ive considered maybe even the in line fuel filter cld be clogged .. Now let me give you a different example.

Mark helpful
157,565

Bob answered 4 years ago

If the RPM is going up and the car is slowing down it can only mean the transmission is slipping. Check the transmission fluid for proper color and level.

Mark helpful

Your Answer:

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