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Have you put a code scanner on it to see if there are any diagnostic codes? I just got done with a round of frustration on a 4.3L Vortec in my wife's AstroVan. In my case, the codes found didn't really point to the real problem anyway, it took some careful parts replacement (one thing at a time) to figure out what the problem was. Fortunately I hit the problem on the second part I replaced.
Does it make the 'rod knock' sound only while driving, or does it do it while in Park also? Let us know what you find out on this, the answer could help someone else out (not just Chevy owners) with similar symptoms.
billy242
1980 242DL with lots of GT and IPD stuff
2000 AstroVan with 4.3L v6
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