I tracked down a ticking noise I had assumed was valve noise or a lifter giving up to the throttle body.  Using a pinpoint stethoscope the heads have no tick the case sounds smooth.  The intake runners have a light tick but when you listen anywhere on the throttle body its a loud tick.  Does cleaning the injector make the tick go away or is that a candidate for replacement typically. 

Ticking noise from the throttle body.   I never did anything about it.   Have yet to have an injector fail.  

Lifter tick is quite different in sound and where it sounds like it comes from.

Injectors can be VERY loud. It's basically normal. If it's working... don't try to fix it. 

Good to know they are just loud. It runs fine gets up to 75mph easy enough, it does take some work to get up to 20 before it gets running good though.