2002 GMC Envoy Q&A

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

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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