Ok well I dont know about the trx 3.3 so wait until someone that does advises you, but you dont want to go too lean. Mine, max I'll lean it 2 1/4 turns open from closed.

If thats what you mean by lean, then yes dont touch it anymore the problem is somewere else. You could also try raising the idle speed that may help. And check your lsn.

Other problem could be your glow plug, you may need something hotter or colder. Tell what fuel your using and what plug.