Q: So my 2000 Chevy Blazer is not wanting to accelerate past 40m

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So my 2000 Chevy Blazer is not wanting to accelerate past 40mph and I have no clue what is going on. Tried checking the O2 sensors and that does not seem to be helping

My car has 150000 miles.
My car has an automatic transmission.

Blazer
2000
Chevrolet
V6-4.3L
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