Runs rough only at 1000 RPM

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Aug 7, 2007
Austin, TX
What would cause this?

Sitting idle (like at a light) the truck is smooth. When I give it gas and it hits 1000 RPM, the truck shutters until I am at about 1100-1200 RPM.

If I am parked and idle it up to 1000 RPM. I get the same effect.

As soon as I go above 1000 RPM, it is smooth again.

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