My 93 Mercury Grand Marquis is cutting off when I stop

Tiny
CHARLENEH407
  • MEMBER
  • 1993 MERCURY MARQUIS
  • V8
  • AUTOMATIC
I have a 93 mercury grand marquis when I stop it cut off but it only do it when I have drove for a couple hours and the hotter it is it cuts off the temp needle says its nt hot but it cuts off please help
Wednesday, April 6th, 2011 AT 6:32 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Wednesday, April 6th, 2011 AT 7:05 PM

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