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First,open the hood and at the back left (your left) you will see a large wire harness attached to a computer.Remove the computer connections and clean them with "contact clean".Reinstall the connections and waterproof this area,as Ford did not and these connections are famous for corrosion.Chances are now your Windstar will run better than ever now.
TO clean the throtle plate use a small tooth brush and some throtle body cleaner. remove the intake hose, spray the throtlebody and then open the throtle plate and spray plate , use brush to clean body and plate then spray clean try not to spray to much into engine , after its clean then start the engine you may have to hold gas pedal down to start as it going to be a little load up with fuel from the cleaner, some time sit will start up on its on and run a little rough for a few seconds and clear up. As far as the mass sensor this needs to be cleaned with mass air flow cleaner, this is a spray like the throtle spray but is made for that sensor and drys fast, spray the two sensors inside but dont touch them or move them spray as close to them as you can to clean them, good luck.
That is correct it could be the idle air control valve, before replacing it try to clean the throtle body and open the plate by having someone hold pedal down so you can clean area around the plate also, most times its a drity throtle, after cleaning and it stalls then replace the valve good luck and hope this helps.
This may be due to a dirty throtlebody or bad idle air control valve, using crab cleaner clean the butter fly plate or also called the throtle body plate, spray area and clean with a toothbrush and this cleans it good, make sure to open the plate and clean both sides and housing, when restarting you may need to hold gas pedal down to get it going and clear it out, with thew engine running spray cleaner into the idle valve hole, rais eidle a little and spray a few times, the last thing is if the low idle is due to a misfire like its skipping then you may have a bad wire, (sparkplug wire) but clean throtlebody also, hope this is helpful to you and good luck.
You need to do a top engine clean to clear out excess carbon cleared out so that the knock sensor works like it is supposed to. You will also need to Clean the throttle plate the inside and outside where the intake hose goes into the engine, and inside the throat where the plate goes. What happens is over time carbon and gas gum builds up and causes the plate to not close all the way and will cause the plate to be open and the throttle sensor will be giving it gas for one position but the plate will be in another area causing a lean burn roll. you can use carburetor cleaner and a soft tooth brush to clean this off to fix the problem. If you need more assistance let me know and I will answer if you need more help and thanks for using Fix-ya.
Try having your fuel injector cleaned, you can start with running fuel injector cleaner though your gas tank and if that does not help then you have to get it cleaned out professionally or even worst have the injector's replaced if they are bad.
The other thing that will give it bad fuel would be a bad air intake temperature sensor go bad, as for the ruff idle that is common to a dirty or stuck EGR valve.
Good luck and keep me posted, by the way, what kind of Garage did you take it too? And are there and DTC codes from the ECM?