Grease up the throttle linkage on the throttle body. My Cossie had a snatching point which was horrendous to drive with, and dangerous sometimes, so I found the throttle linkage was sticking and greased it up. It's been a dream to drive since. Now all I have to do is put the head back on.

Just off on a tangent though, I'm a bit peeved that 7 people viewed this thread and didn't offer any advice.