Also double check that the head hasn't pulled out of the lever by pulling it away from the frame and shifting against hand tension, the cable must move cleanly as you move the lever. If it does, the problem is downstream, most likely a loose FD pinch bolt. (you'll see marks on the wire where it slipped)
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.