sharp76

Hi all, went to suabru today with my jap my98 sti to get my ecu read as the car has starting problems(when start it in morning takes approx 5 seconds of turn over to start, if i switch it off and try again its fine, if the cars left approx 10 mins swithed off and try and start it again it does the same, no difference if car is hot or cold), guy said cam sensor is faulty, changed it with my mates my99 jap wrx, no difference, got one from local breakers no difference but i dont know what year or type of impreza its off as guy didnt know, are all cam sensors the same and could this possibly be a wiring problem more than the actual sensor itself??please help cos this is doin my head in!!!??????