Engine will not rev problem?

For engine not revving problem,
In related to this problem.This are the help links provided below.Check the link below directly and go through the troubleshooting:-----

Engine won’t rev up past half throttle?

http://technoanswers.blogspot.com/2012/01/engine-wont-rev-up-past-half-throttle.html

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Car Shifts hard and Engine Revving in stop?

http://schematicsdiagram.blogspot.com/2011/12/isuzu-trooper-shifts-hard-and-engine.html

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Car won't rev past 1900 rpms?  

http://howtobyme.blogspot.com/2011/08/car-wont-rev-past-1900-rpms.html

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This will help.For more help.Keep updated.