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My Impala has been having trouble accelerating and will completely stop pulling once I hit 40mph, it has also been sputtering. I have already changed the fuel filter and used fuel system cleaners. I read numerous explanations concerning like symptoms with responses ranging from a o2 censor to the transmission, though I do not believe it is the transmission as I am having no problems with rpms. Any insight would be a great help.
 

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My brother in law had trouble like this with his dodge ram. Turned out he had blocked catalitic converters.
 

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My brother in law had trouble like this with his dodge ram. Turned out he had blocked catalitic converters.
theres been quite a few w-bodies w/ that issue. Hard to tell what it is w/o hooking up DHP Powertuners or other scanner....
 
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