cant keep 1998 mercury marquis running, it'll start and run if i Feather the pedal, once released stalls out.
3 Answers
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)
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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.
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As said, check the idle air control valve. If its not working, it wont let the engine idle, with your foot off the throttle.