The TPS applies a light spring loaded tension to the throttle, but it is exactly the same whether the engine is running or not. The description you give sounds like the engine vacuum itself is what you are having trouble overcoming. There should be a small hole in the middle of your throttle blade. Check and make sure it's not plugged. Next, try adjusting the idle screw in (count how many turns so that you can put it back afterwards) and see if that eliminates the problem. If it does, then you have a problem with your idle circuit, and your IAC valve.
Take care,
-Chris
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