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Discussion Starter #1
Gutless. Truck starts trembling even on a small grade and down shifts. Fresh filters/service. Noticed today while in park, hold throttle down at any rpm within a few seconds without moving my foot at all the rpms drop drastically. Almost like putting a load against the motor. Thoughts?
 

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Fuel supply issue. Filter or regulator screen clogged? Put a test gauge on it or it’s all just guessing.
 

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You really need to get a reader that can see Fords live data while the truck is running.

Your problem can be any number of things starting with the fuel or all the way to the oil that you are using.
 

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Discussion Starter #4
Thanks for the feedback. For what it’s worth I took the tps off the pedal assembly sprayed it with wd-40 and the only noticeable change was now you can hold the rpm’s wherever you wish (in park) and it holds there. It no longer backs off on its own. But didn’t change the way it runs under power
 
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