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Q: Replaced throttle body and now mpg has gone down. on 2003 Chevrolet Silverado 2500 HD

I had a problem when the (low engine power) would come up in cool conditions but turn the engine off and it was ok. I replaced the throttle body as advised by repair pal and that problem is cured. I replaced it with an AC Delco body but now I seem that my mpg is down a little. Does the computer have to be reprogramed for this throttle body. Other than poorer mpg the engine runs great. Just wondering????
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I didnt replace the throttle body gasket, it looked ok to me. The motor has about 94000 miles on it and I had the plugs replaced at about 80000 miles and the aircleaner is new. I know it sounds like I am nit picking about a drop of 1.5 mpg but if I drive easy I was getting almost 15mpg but not on the average. Im retired and this drop means a lot to me.
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