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MPG decrease

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I went from 14.5 mpg to 11 mpg within 1 month. i have a 98 2500 350vortec manual trans. i changed the fuel filter, air filter, pcv valve and ran injector cleaner for 2 fillups. I have not done a tune up but I did check the plugs and they look fime. I have also notices a loss of torque at low end. I used to be able to chirp the tires from a slow roll now it seems to "gag" until it hits 1800 rpm. :confused: Any one have some suggestions.




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