Why cant john maine finish a game?

Question

Why cant john maine finish a game?

Answer 1

jerry manuel pulls him out and he is injured to much

Answer 2

Right now because he's hurt.

But this season, basically he hasn't been hitting his spots, so he's running deep into the count.  Plus the way his fastball moves, he ends up getting a lot of foul balls.  Teams have been really patient with him and running up his pitch counts, and managers/coaches typically pull their starters after 100-120 pitches or so, to prevent injury.