Starting problems-- Subaru Legacy P0335

The timing belt was replaced last fall. I haven’t put on much mileage since. The starting problems began the summer of that year. The starting glitch happened so rarely at first that I didn’t notice the pattern.
There’s a pulley wheel in front of the timing belt that sucks to pull off, hence my phobia. Having it off once makes it easier but I still get nervous putting force on nuts and bolts on the engine block.
Do you see potential problems or are you noting the mileage?