96 Chevy Blazer won't rev up when you give it gas?

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Crx150zc

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I bought a Chevy Blazer that hit a deer, It took me over a year but I got it all put together, 150k automatic 4.3l It will not rev up past 3k rpms and if you floor it, it just kinda stumbles down to 2k rpms, I put in a new fuel pump because the fuel pressure was only 50-55lbs. I did notice it got a lot better but after one day of driving it was back to the way it was. I am not sure what to do next, I did get a check engine light for 3 of the o2 sensors running lean so it might be another bad fuel pump but I just hate wasting money especially that much money :)
It runs nice a quiet and can be driven as long as you do not give it a lot of gas.
 
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