check your motor mounts.

Hello, I have a 98 Civic DX  5 spd that has a knock when I am coasting.
 It stops when I brake, or accelerate, or if I press in the clutch.
Does anybody have any Idea what this could be?  I have heard it can be
the bearings, cv joints, or a warped rotor.  The car also sorta rumbles
if I  accelerate too much in 1st gear.  Any help on this would be
really appreciated.  Thanks in advance!

If the timing is not set correctly--it can cause pinging and knocking
problems.

I vote for the CV joints. Basic inspection is easy, but there have been a
lot of reports of noisy CV joints in Hondas without the boots being torn.
Raising one front wheel at a time and rotating the wheel while feeling
carefully for lumpiness may offer a clue. I'd turn my attention away from
the bearings because the noise is dependent on the torque, and bearings
typically don't care about that.

Mike

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I might vote for the inner CV joints, since they flex so little they
don't show up the way the outers do. A google (groups) search might find
lots more.

'Curly'