Throttle position sensor works like a rheostat.The farther you push it down,the more current goes through it to tell it to speed up the engine by giving it more fuel.You should see what codes it kicks out and go from there.I dont think your problem is the throttle position sensor.I could be wrong,but either you are going to throw a bunch of parts and money into it,and not fix it,or you can try and see what the codes are and then ask somebody,maybe a Ford mechanic what they say.I wouldnt bet they will be able to give you the right answer,but from experience and trial and error they might have a good idea.I still think its a fuel pump because of your symptoms.If you think about it,a TPS is either going to speed up the engine as you push on the throttle,or not.Thats about all it will do.If it has an EGR valve thats full of carbon and stuck,that would make it run bad.There could be other sensors that are bad.I would think the TPS is the last thing it would be.
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