At higher rpms before each shift I get a bunch of random clicking coming from the engine. When it shifts, no clicks... when I decelerate, no clicking. It does not do this when the car is in park and I rev the engine, only while driving. Does occur with bumps in the road, or turning, or braking. If I hold it at that higher rpm, the clicking continues.
When I had the truck I had some 'pinging', or detonation when something was wrong with the timing etc etc. High rpm's= bang bang bang. This made me think something with injector nozzles, timing etc. Did a valve job about 5,000 ago and checked teh timing chain stretch. 6 degrees I believe it was.
I found this thread, but it dropped off.
Engine Clicking