At 4000rpm the motor is jumping/shaking real bad. Bad plugs or fuel filter?

What other conditions , besides 4000 RPMs?,...//////////...08/12/14....... Yes , replace everything you can , and if problem still persists , reply , next time you post a question...............

Could be the motor mounts. Agree, more info needed to give you an answer

It means stop Reving the engine. Mine does the same thing. That's just as far as it will go