Not much to say - in first and second gear, car starts jerking violently when given any gas. The best association I can make is that it feels like the clutch is bouncing off of the flywheel, but that's just a guess - could be a sensor issue. CEL is not on. This happens predominantly when the car is cold. Clutch has been replaced, I am fairly sure car was abused by previous owner.
This happened to another used car I have owned before (the exact same feeling), but only with reverse. That car was also tracked prior to me owning it and clutch was replaced.
Any ideas on what could be causing this? Weak pressure plate?
P.S. I read the accepted answer here: Why does my clutch "bounce"?
I don't think that applies to me - I have driven a lot of manual cars smoothly, so I really don't think it's "user error", it's pretty dramatic and I can't moderate it by different driving patterns.
Edit: Car in question is a 2009 Honda Civic Si. 108k on the clock. I have also had this issue happen with reverse gear on a 1990 Miata.