2000 Plymouth Neon Question: Replace cylinder head fix the problem?

Spark plug in cylinder 2 came out after putting it back in two years ago. Took it into a shop to just have all the cables and plugs replaced. Went back and the engine is running rough. Mechanic told me it isn't holding compression due to the threading on cylinder two and head needs to be replaced ($1200). I ran it by another shop and they pulled P0302 error code since my check engine light is now coming on. This morning the check engine light was not on and the car is still running a little rough, although not as bad as yesterday. Should I still consider replacing the head?