cant keep 1998 mercury marquis running, it'll start and run if i Feather the pedal, once released stalls out.

130

Asked by Jan 06, 2013 at 06:23 AM about the 1999 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

3 Answers

95

If it runs rough then I'd say check sparkplugs. If it's smooth it might just need to have the idle increased by a mechanic (or yourself if you know how)

1 people found this helpful.
29,855

check for a vacuum leak at the motor. or the idle air control valve. idle is set by the pcm on that vehicle and cannot be adjusted.

1 people found this helpful.
255

As said, check the idle air control valve. If its not working, it wont let the engine idle, with your foot off the throttle.

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