idle problem and when i driving the car gain speed without touch gas pedal,

1999 MERCURY COUGAR
32,000 MILES
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ARTEBO
  • MEMBER
  • 1 POST
when start vehicle fisrt time in the morning is humming sound from the intake,also idle is goes up and down and when i turn the heater and is stall. i clean the IAV valve but still acting up what else can be?
Nov 18, 2011 at 7:30 PM
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FIXITMR
  • ✓ASE Certified Mechanic
  • 9,990 POSTS
  • ASE Certified Mechanic
sounds like air leak making noise and causing bad idle. when in gear this causes acelleration too.
Nov 18, 2011 at 8:18 PM
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