Base Engine Misfire with Abnormal Valve Train Noise

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
Worn, damaged or loose rocker arm	Inspect the valve rocker arms. Repair or replace damaged components as required.
Worn, damaged, loose or bent valve push rod	Inspect the valve push rods. Repair or replace damaged components as required.
Worn, damaged or stuck valve, carbon on the valve stem or valve seat	Inspect the valves. Inspect the valve guides. Repair or replace damaged components as required.
Worn, damaged or dirty valve lifter	Inspect the valve lifters. Inspect the camshaft. Repair or replace damaged components as required.
Worn or damaged camshaft lobe	Inspect the camshaft. Inspect the valve lifters. Repair or replace damaged components as required.
Worn, damaged or loose timing chain and sprockets	Inspect the timing chain and sprockets. Repair or replace damaged components as required.