Q: reduced engine in my chevy 2000 subrban

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from 60 mph to 10 mph if lucky

My car has 2680000 miles.
My car has an automatic transmission.

It is possible that you could have a check engine light. I would recommend having your vehicle inspected by a qualified professional to determine the exact cause of this issue. If there is a check engine light getting the trouble codes would help to diagnose the issue.

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