Q: 2002 Envoy XL with 4.2 engine, at cold start up,the engine sounds like a Diesel, on 2002 GMC Envoy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
at cold start up the engine sounds like a Diesel for few minute ,when it warms up it is quietes down.
Also when exelerates,have this grinding noise,sounds like a bad bearring .At warm idling,very quiet
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