I tore this new 4runner apart yesterday and put a new cover, steel guide, timing set, oil pump and water pump in it. It's running like a champ now but at one time I heard that if the MAS had been modified, the timing needs to be advanced more. I initially set it about 5 btdc and got a little pinging. I advanced it a little more by ear while out on the road and it has tons of power. If it's running good leave it or do I need to set it more specifically because of the computer??