I have a 2000 4.4 with 126K that does the same thing. Responses on this forum and from my indie assure me that this is normal and nothing to worry about. Mine is louder on a cold start-up for about 1 to 2 seconds. Otherwise, at idle, hot or cold, I get the tick-tick-tick sound. Check out some of the posts under my name (jaypete1) where the post subject is "clackity-clack on cold start-up". Evidently the 4.4 is known for this.
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