Try spraying carb cleaner around the intake if idle increases it is a bad intake gasket. It also could be a bad plug/s, wires, or low compression in one of the cylinders. At higher idle a slightly lower compression cylinder is not noticeable but after warming up the idle drops causing the cylinder to have a misfire.
SOURCE: stalls when put into gear
Its possible it could be other things causing the problem, but seeing as you've checked most of the likely causes, it is most likely your Torque-Converter. The lockup clutch in your Stator-Fan located inside the Torque-Converter could be siezed, causing the car to stall.
SOURCE: 1988 Ford Taurus hard start problem
Change the coolant sensor located close to the thermostat housing. This is easy but do not over tighten it. You will have the same problem if you do. Tighten till it does not leak only.Good luck!
SOURCE: 2000 expedition 5.4 lt run fine when cold when
a very common problem for the 5.4 fords is the coil packs going bad. normally misfires once heated up and under slight load ( in overdrive going up a grade) if the check engine light is on, it can help pinpoint which cylinder is misfiring. if plugs haven't been replaced within last 50-60k miles, plan on replacing plugs, and usually the coil pack that goes bad is one of the rear ones, but impossible to tell without a scan tool. if you don't own one, take it to a shop
It Sounds like it is staying in the "cold start" routine. It also sounds like the diagnostic computer is not working right, because it must be rich and the O2 is not telling you a thing.
I would start by looking for a temperature sensor. You may have 2, with 1 being for the dash and the other being for the engine controls. You want to replace the temperature sensor for the Engine controls. This will help get it out of "cold start" routine.
Change your thermostat. The onboard computer does not monitor operating temperature.
Fuel pressure regulator. Have pressure checked.It could be forcing too much gas in each time an injector opens.
If you can not do this yourself, tow it in. At 2 mpg it may be cheaper to tow it than to drive any distance for repair. The Mechanics are going to need some gas left over in it to work on the engine.
Also turn on ignition and energize the fuel pressure, check for leaking fuel lines. Put on fuelcap locks if fuel drops when parked.
For this much of an extreme problem, I would like to know what you find wrong with it. I hope my solutions help.
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