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Problem Solved, heres the update and eventually the fix, tried running wires no change tried replacing the main engine and transmission harness and you guessed it no change still idles high. I began really studying the wiring diagrams and went sensor by sensor to all those affected and found...

So I had it towed to Ford after months of frustration. They had it for 3 weeks and determined it is a wiring harness issue even though they cannot pinpoint the exact area or wire that is damaged. Since a replacement harness is no longer available through Ford the remedy they gave to me was...

Yes the idle drop, idles erratically but does drop significantly almost to normal

I can check continuity between the wires from the connector at the ecu to the connector at the iac, that is if there is a direct connection, because I don’t have a BOB to do a full blown pin-out. I peeled back the loom down to where it meets the bulk of the harness from the iac connector to make...

My buddy has been using a autel maxisys and a jbox to read codes data and program.

So quick update, replaced the ECU and got it programmed to the vin. No change still idles high so I am at a complete loss i am open to any suggestions at this point I have too much time, money, and sweat invested to just get rid of it (it has crossed my mind) I have a feeling its going to be...

the ECU controls the idle via the IAC depending on what it reads from the 'inputs' such as air temp, coolant temp, throttle position ect. So if the ECU is reading that it is -40 air or coolant it wants to raise the idle via IAC which is post MAF so it lets in more air to the throttle body after...

it idles poorly but will stay running for a few minutes with IAC unplugged, same if I disconnect the MAF goes into a sort of limp mode.

So quick update, had a friend come over with his Snap on Scanner and we could not establish communication with the ECU, he tried multiple times. I am sourcing a ECU now and am going to try it and see what happens.

I will take a closer look at the booster, hard to spray the carb clean when the engine is racing already but I’ll try. Also wouldn’t a smoke test reveal a vacuum leak that bad? I have gotten it smoke tested by 2 different machine and no leaks found.

I tried what you said, no change. I replaced the aftermarket IAC with a Motorcraft one still no change, tried a ford MAF still no change. Im starting to look at the ECM as the culprit, my temp inputs are all over the map each time I hook up the code reader so im thinking the ecu isnt processing...

My 03 Explorer 4.6 is idling super high 2800-3000 rpm upon start up and does not come down, I can not even put it into gear because it’s reving so high. So far I have put a new intake manifold, iac, tps, maf, egr valve, egr pressure sensor, 4 o2 sensors, cylinder head temp sensor, pcv, all...