Your 2002 Caviler RPM needle jumps and you can feel the car buck at all speeds What can it be?
All signs point to your transmission. Get this checked out ASAP, otherwise your car is going to get suck in one gear, and you will blow your engine, let alone get stuck who knows where because your car won't move.
Your 2004 Chevy cavalier has the check engine light on you had it scanned and it said evap emission control system large leak how do you fix it?
I own a 2001 T&C and have experianced an issue a couple of times with my speedometer where it stopped working. Upon closer inspection, somehow the needle had flipped all of the way around (I think it happened when I was replacing the battery). All it took to fix was physically moving the needle back to the correct side of the rest pin (minor dissassembly of dash required, but not too time consuming).