I have a 1994 Chevy suburban using more gas than normal?

Mark

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I have a 94 chevy suburban i just had a different engine put in it that has 86k miles on it i got a tune up and oil change but like when i pull off it acts like it doesnt want to pull off then i hit the gas a little more and it drives normal but it's using a lot of gas and i no the tank does not leak what could it be
 
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