What would cause Motor to visible shale @ 1250RPM. Then go away at 2000Rpm and above no shake below 1250RPM

First off this should have been posted in the Engine, Chassis, or general tech section.. NOT the introduction section. Sadly our Ghost MODS work this place like a government job and self policing it helps.

That being said....

Year of truck, overall condition and mileage of said truck?
What engine?
Auto or manual?
Whens the last tune-up you gave it? Stock wires? and plugs?
Is the truck old enough or been maybe rough housed that you could have a engine/trans mount bad or loose?
Has there been any recent work done to the truck?
What modifications have you made | Ignition, I/M, E/M?
Are you getting a CEL light on the Dash?
Have you already tried to pull any codes, Is it OBD II or OBD I (again year of truck helps here)...

No one here as far as I know worked for the Psychic friends Network. Some details and information on your part will shorten the task and time to ask all of these pertinent questions to get you the right answer otherwise we know as much as you do. Well maybe a little more because we are asking the questions above.

Ball is in your court

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