Clutch Cable Problem after Clutch Replacement?

I put on the Steeda Firewall adjuster and got it to the place I like it to engage at. The pedal vibrates when driving and on startup, and I have still not figured out this problem. At 68k I wouldn't think the clutch cable itself would need to be changed? My friend said that the cable itself seemed loose and that it should be tighter. Could a loose cable be causing the clutch pedal to vibrate? If so how can I tighten it?

Yea I messed with the quadrant and messed with the engagement there too. If I went to far it started to make the loud ticking noise just like the TOB's sound on our cars, so I moved it back far enough so that it wouldn't make the noise. The clutch engaged where I wanted it to, but then I noticed the Pedal would vibrate on cold startup and make a loud tapping noise. So I ordered the Firewall adjuster and it quieted the tapping noise on startup, but the pedal still vibrates some on start and while driving. So I guess that is my final problem is the pedal vibration that I am receiving.

-Karl