I have a 97 sunfire and recently noticed a knocking noise coming from the front. Its not really loud unless you pop the hood and listen although you can hear it inside as well. The noise goes away if you push in the clutch. Let it back out and it starts again. Ive noticed an occasional popping that I can feel in the clutch pedal when down shifting but other than that the clutch feels great. I have noticed that its starting to get harder to put it in reverse without it grinding a bit. I had an izuzu rodeo make the same noise and found out it was the throw out bearing. I figured I would ask the forum for any ideas first. Thanks in advance.