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Ok, I have a 07cobalt SC, stock fuel injecters,stock exhaust, 2.9 pulley, mod air box.ok now when my car get any lower than a half tank of fuel it will staul out on me when I'm making a pretty good [email protected] between 5000-6000rpm.it will also do the same bog down thing, makeing a sharp turn such as takeing an on ramp on to they highway,or climbing a fairly steep hill,but when my vehicle is in the act of doing either of two things it will do it at a much lower rpm ,any were between 3200-4000rpm.need help dealers are dumb,and its not very fun trying to merge on to the highway and your car starts to staul out,so if any one know anything that will help ....well then please help.
 

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Sounds almost like fuel cutoff. Your fuel is sloshing around and your fuel pump can't pump any up to the engine. I'm not sure what the inside of our tanks look like if there's baffles or not.
 
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