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[BonsaiGT]

That's a good idea...thank you...but I don't think that's my problem. My oil pump seemed to be in good condition, so I didn't replace it when I installed the new chain and such. I kept all the original bolts, except for 3 of 'em that I broke installing the water pump. (The torque spec was listed wrong in the Chilton's manual that I was using.)

Whatever the problem is, it goes away almost immediately after I start the engine. It seems to happen less often if it takes the engine longer to start...mostly when it's cold. If the engine is already warm and thus fires right up, the noise is louder and longer, but still no more than about 2 seconds worth. Then it's quiet, and I get none of the "broken guide" sound when you get off the throttle. It's very weird, and it bothers me quite a bit. The last thing I want to do right now is have to take the timing cover back off. And right now, I wouldn't even know what I've fixing, 'cause I have no idea what's causing it...