Hello....need some help...replaced new parts in 888 i/0...new gimble bearing,u joints,did alignment ,new lube,greesed everything up....but still has a little noise at idle,then when you take off it sound like a growling sound...the sound sounds like its in the back of the engine area,hard to tell from where....the noise does not get worse when turning steering wheel hard left or right...doesn't sound like a gimble bearing...I was thinking it might be the water shutters ..if it is it has to be down in the y at bottom of boat in back...I'm kinda lost what to do next...I don't want to have engine pulled for sure...any suggestion will be greatful...thanks