How to fix sticky lifter.

that might have been it. We added a bottle of Rislone, and then we took it out. handled fine. However, when we were driving it, it was in first gear and there was a clunking noise. pretty loud, but the engine didn't lose power or react to the clunk. the clunk was the only "symptom". Any ideas? also, the car vibrates constantly (very little vibrations). I think it is just the "rumble of the engine" because it's an old car. Is that likely what the small vibrations are? (Sorry I'm so cautious, this car is my baby :) )