fuel consmtion problem

My yukon is totally gutless off the line and going up hills. I can tell its getting too much fuel because if I let off the excelerator it perks up a bit. But not enough to speed up. The throttle body was "recently" rebuilt says the guy I bought it from. . Anyone have any ideas? Thanks

Hi, Guys I have 08 tahoe LT, I have a problem in fuel consumtion. I used it in state of Qatar which the weather is hot most of the year. I used it to go to my work about 33 KM from my home ( almost high way ) I checked the avr. econ. ( after re seting it ) it was 16.3/100 L/KM I compared...