I have an 03 cobra I was currently running a 3.1 upper sc pulley with a diablo sport chip, and bassani exhaust. I changed the 3.1 and put a 2.81 pulley on the stock eaton and after driving it around for awhile with some hard acceleration it was fine. Then out of knowhere under hard acceleration it has started stumbling and falling on its face. I put the 3.1 back on and now it doesn't do it anymore. Also I have been noticing before that it had an extended crank like maybe the fuel pump is geting weak. It only has 33k on it. I was under the understanding that all I needed was the custom chip when making pulley upgrades like the diablosport chip I have. So does this sound like a fuel problem to you guys because the chip I have is tuned for the pulleys. How good are the stock pumps what are their hp range. If it is a fuel problem what kind of pump should I get. Any help is appreciated I'm open for all suggestions of what I need to do. THANKS