Many things can attribute to this... best thing is to have a trusted mechanic do a diagnostic...
it starts in the ignition system and goes into the fuel injector system... see what i mean?
It could be somtihng as simple as adjusting the fuel ratio... I'm not fully knowledgable about Taurus.. is it a fuel injection? or actual carbuerator? Carbs are easy to adjust with the proper book but injectors I honestly don't know..
Look for a Haines or one of those kind of books and check it out. the books are usually about 20-30 US dollars.
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I had the same problem with my 99 ford taurus. My ford taurus did exactly did same things that your vehicle is doing. runs cool on the freeway because the air is going through the radiator and cooling the water down.I checked the cooling fans, radiator and hoses for leaks also replaced my thermostat. nothing solved the problem. turns out that the new antifreeze does not come with a lubercant property any longer. you have to buy the lubercant additive separately and then add it to your cooling system when you replace the antifreeze. the lubercant protects your freeze plugs, water pump, radiator, thermastat from rusting out. Meanwhile because of the absents of the lubercant, my water pump impellers rusted out and dissolved. so the water pump had no fins to circulate the water. Luckly for me, I discovered that my car was still under warranty due to an extended warranty I had purchased when I bought the car. ford dealership replaced the water pump. Problem Solved.
My first thought is to have the Catalytic converter inspected. Many time the converters will have the insides break away and begin to float around, the insides of the converters look like a honey comb and after the engine is good and hot the dislodged piece will adhere to the other parts of the honey comb thus making the rattle go away.
check all of the vaccum lines and the one behind the throttle body also try some STP gas treatment and if this helps replace your fuel filter also make sure you have at less a half tank of gas before you add the STP.
I have a ford taurus 2000 and it gave me this codes PO171,PO174,P1504 The car rus good for 20 t0 30 minutes and the car in the stop signs and light turns off but turns back on fast but turns off fast too but it runs good