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3.8L 2013 Chevrolet Impala LT w/o police package
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Discussion Starter · #1 · (Edited)
I have to replace both of the: intake manifold & valve cover gaskets.

Found the "random" misfire, and possibly the cause of the overheating. Rocker arms & valve lifters.

Replace the broken rocker arms and valve lifters, replace 12 on the back or replace front & back?
 

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