I have rough running until it gets warm then it has hesitation when accelerating

1999 LINCOLN TOWN CAR
12,000 MILES
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REAON THOMAS
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I own a 1999 towncar and when cold, it runs extremely rough for up to 20 seconds, i try to give it gas to make it idle better but it only gets worst. Once warmed up it idle's fine but, when accelerating the car hesitates tremendously. Is there a way i can fix it myself. As of 2 months ago has new fuel pump, new coils, new oil, new filter, and was running fine after the tune up
Oct 12, 2011 at 6:14 PM
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JACOBANDNICKOLAS
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Have you checked the IAC and for vacuum leaks?
Oct 12, 2011 at 6:22 PM
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REAON THOMAS
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not 100% sure what the IAC is but i changed the idle control valve/sensor, and made no difference. throughly checked all vacum lines and vacum connections but no visible problems... there...
Oct 12, 2011 at 8:23 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
IAC is the part you replaced, idle air control valve. If there are no leaks, make sure the IAC is getting power and the part is functioning.
Oct 12, 2011 at 8:41 PM
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REAON THOMAS
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thx will double check my installation.
Oct 12, 2011 at 9:31 PM
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