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Q: When I first start it it makes a pinging or tapping noise, I think we used to on 2001 Pontiac Firebird

call this noise tappet noise. It goes away usually after the engine warms up.
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Could be oil related. May have valve lifter that takes a while to pump up. But most likely it is an exhaust leak at the manifold. They can make a fairly heavy tapping/pinging noise cold. The manifold warms up & expands, thus the noise goes away.
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