engine shudder/shakes when put into gear while stopped...

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Hi, as above I have changed the fwd/aft eng mounts as the fwd was u/s. this improved the shake a bit. but I notice that if i put it in reverse the shudder is nearly all gone, but if I put it into drive the shudder is most definite,some days it is not as prominent as others but is always there ,also while trans is cold and I pull up a little bit rapid the release of top gear is a bit of a klunk ...I suspect sticking valves but not sure. Rgds..John