Infiniti J30 w/ VG30DE motor

hearing a slight noise coming from engine bay, sounds similar to a knock but not quite... happens occasionally, sometimes louder than other times - any ideas to what this could be? when possible I will check fluids, as per i am at work at the moment... also, anyone have any parts for this? ie: sunroof motor, passenger window motor parts, stock radio, headlight-relay, front struts, etc..? Thank you for any cooperation,

Mike


P.S.. Anyone know any good shops for Nissan/Infiniti? I don;t want to pay a lot but would rather pay for service than anything..