Here is a link to the Chevy Piston slap website that claims the noise is a maanufacturer defect in late 90s gm engines.
http://www.pistonslap.com/index.html
-------GM Carbon buildup removal------
I need some advice,
my tahoe drank some bad delaware gas and I havent serviced it in a while. It was running really rough and throwing codes. po300 - po 305 - po 172 - po175 - and oxygen sensor on cat. was bad.
I installed:
distributor cap and rotor -
new spark wire set -
new spark plugs...
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