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when your vehicle is in park the rpms will rev and and down fluctuating. howver, when car is in gear it will seem to be fine. but, as problem gets worse it will shift to higher gears. for ex. when mine went out my car maintained 45 mph without doing a thing. also, when you go to slow down it will jerk because it is having trouble switching to lower gears due to air intake.
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What happens when iac valve goes bad?
one thing that happens is that it doesn't idle properly and stall out a lot
1988 thuderbird Start and when it goes to idle down it quits What do you need to test and how?
check your idle air control valve and/or your TPS
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More than likely it's your Idle Control Valve.
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The idle air control valve will be located by the throttle body.
