may sound wierd,but pull valve covers and check ur pushrods and rocker arm, may have a beant or broke one, not leating cylinder fire corectly
Check the fuel pressure.
the reason i dont think its valve train cause the sound isnt continuous.. it only happens everyonce in a while, i have had a lifter problem with my other truck and it knocked everytime the truck was on but this knock is very faint and only happens once or twice the whole time im in the truck... but the fuel on the other hand is something i have never had a problem with so that could be and issue
Ok first i need to say sorry to Allen for questioning the tune.... second thank you to emmeric5.3 cause i went to clean my MAF and i noticed 2 of the wires were cut a little bit and i guess they were touching so it was shorting out so i cut them and shrinkwrapped them and now my truck is running way better hasent missed since... Sweettt
haha, no problem, just glad you got it figured out.
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'94 Chevy Truck: 8.9 et, 408 twins