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2000 impala hesitates when I step on the gas but runs good like no problems and I had 2 codes poped up 1) O2 sensor code found broke wires replaced sensor.2) EGR pintle stuck closed cleaned out EGR ports and EGR...STILL doing SAME HESITATING CRAP so I went to the auto store bought this 130.00 cat converter cause they said this would fix the prob. they sold me a universal one THAT WAS NOT VERY UNIVERSAL and it was not the problem and cost another 80 bucks to weld it on still same prob.....replaced fuel filter also checked for vacum leaks everywhere there are no trouble codes now but still doing same thing anyone please help Im just a poor white guy and I know quite a bit about chevy motors but this one has me stumpted and almost broke
 
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