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Originally Posted by djstifft
I had the same idle problem on my 93 3.0L Taurus. I changed gas filter, spark plugs, plug wires and cleaned the idle air control valve. Nothing happened. Then I went to Auto Zone to have my generator and battery checked and I noticed that I had a very low idle rpm, around 500. I just adjusted the idle rpm screw a few rounds and now the problem is gone.
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Well, you didn't fix a darn thing, you merely bandaged the problem. In fact, you probably complicated things. Now the throttle position sensor is never actually at the original idle position. In your post you didn't mention cleaning the throttle body. Take off the air cleaner hose where it attaches to the front of the intake plenum. You should see the throttle butterfly. Clean the hell out of this. Better yet, take it off. It only has four screws and maybe some linkage. Get all that black stuff off.
If you do this, I almost garantee that the idle will be excessive since you adjusted it up. I have done this many times. I once bought an '87 Sable that would not run worth a crap. I cleaned the throttle body. Then the idle was extremely high. The previous owner did what you did. Now I had to adjust it down and pray I get near the factory setting.