2001 GMC sonoma 4x4 4.3 V6 problem

Very weird thing going on here. Ok, when pressing the gas it seems like you have to give the truck a lot of gas to get it going, like the transmission is low on fluid or something, and in reverse trying to
back up an incline, the rpms just keep on revving pretty much and it will hardly move the wheels. Something is definatly not right with it, If anyone can give me an idea as to what could cause this, thank you in advance!!
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