I took my car (340/4 spd.) out for a drive yesterday (about 14 miles round trip). When returning home I got about a block from my house and when I let up the clutch pedal in first gear there was a slight grinding sound. I pushed the clutch pedal down and let it up again and there was no grind sound. I pulled in my driveway and was sitting still waiting for the garage door to open. Once opened, I let the pedal up to pull in the garage and heard the grinding sound again. Again I pushed the pedal down and let it up again and no grinding sound. I did this a couple more times and the results were the same, sometimes the grind sound but most of the time not. I'm not that knowledgeable when it comes to clutches so my question is, is this possibly some sort of adjustment issue or is the clutch going bad?