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idle issue

Discussion in 'Ford Trucks' started by Scenic Lawnscape, Nov 28, 2003.

  1. Scenic Lawnscape

    Scenic Lawnscape Senior Member
    Messages: 481

    i have a 91 f-250 351 auto 4 x 4 i just did a tune up i replaced plugs wires cap rotor new air filter (k & n) Now at idle it runs ruff but if i give it just a little gas just enought to get the revs up it runs fine, and it runs really ruff when i first start it up ( if its cold) warms up and it runs better but still ruff. is there anything i can do to correct this problem, this is my plow truck and the snow is starting to fall and i dont want to be stuck out in the middle of a storm some where and it start die on me.. thanks for any help you guys can offer

    Rich
     
  2. 86burban

    86burban Senior Member
    from chicago
    Messages: 130

    Try the IAC first. I had the same problem 3 weeks ago. I went to the junkyard, got a replacement, and it works fantastic.

    Tony
     
  3. Foxfire

    Foxfire Senior Member
    Messages: 153

    Idle

    It could be your converter....
     
  4. tuna

    tuna Senior Member
    Messages: 488

    What the hell is an IAC.My 89 351 is idling at 1000 RPM and all the sites I got to seem to indicate its the IAC but I dont know what an IAC is,any help?
     
  5. Scenic Lawnscape

    Scenic Lawnscape Senior Member
    Messages: 481

    tuna,

    is your carb or fuel injection? if its fuel injection your iac in on the drivers side of your trottle body, there are 2 bolts that hold it on, you will have to remove the air cleaner and hoses to get to it there is a wire that plugs into it and when you get it off there are 2 little screws that if you take them off you can really clean it. i used carb cleaner but some say not too
     
  6. 86burban

    86burban Senior Member
    from chicago
    Messages: 130

    Idle Air Control.
     
  7. tuna

    tuna Senior Member
    Messages: 488

    It is fuel injected.Idle air control ,thanks I have been told that its a common problem with fords and cleaning it will help.
     
  8. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    It can be the idle air controller or the throttle position sensor. Or a vacuum leak in the intake. Let us know the steps you have taken to fix it. We can go from there to help you.