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Cross post from ford, too slow there...I have a 91 E250 w/efi 5.0/AOD. Has always ran great till this am. I hit the gas to pass a semi, then upon passing, found that I had "cruise control" that is, take foot off gas, keep going. I do not have cruise control. Stopping is standing on the brake, with the engine roaring at ~2500 rpm. Under load, it feels like 1/3 trottle min. at all times. I can go faster, but not slower. If I give it just a little gas, sounds almost like its detonating. Upshifts waay too early, downshifts early too. A lot less power than usual. So I pulled the airbox, air hoses, looked good. Butterfly valves didnt look stuck, appeared to close all the way, but I hosed em down with cleaner anyway. I pulled the idle solenoid connector with no change. All the throttle springs, and cable look okay. It looks like the intake valve is closing properly while off, but come to think of it, I didnt check while running. There is a second cable that goes down to the AOD, attached to the throttle, I think to control shifting. Seems to operate okay, but Im not sure what it is supposed to look like. WTF am I missing?
 

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Something has to be holding the butterfly open, or the idle air bypass plunger is stuck full open. Disconnect the bypass deal off the side of the Throttle body, and clean it out real good with some throttle body cleaner. Then re-install. Just a guess.

Or, maybe the AOD TV cable is binding???

Your gonna have to do some more investigating.
 

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Pretty much has to be the Idle Air Control valve if the throttle butterfly is closing. Put your thumb over the hole that goes to it on the outside of the butterfly. If it brings down the idle, that's your problem.
 

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I had a somewhat similar problem with a Mustang 5.0 where it would sporatically idle high.

There where two plugs near the back of the intake manifold (called salt and pepper shakers by Mustang guys). These plugs commonly fail. If you have them, unplug them, spread the male end with a pick, lube em' up and insert.

Also, you may want to check the TPS sensor. When it is removed it needs to be reset. There is plenty of info about that on this site:


http://www.corral.net/main.html
 
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