1995 gmc jimmy

my gmc idles fine but when i take off its a lil rough and my rpm’s wanna stay between 2.5 and 3 when i’m driving if i let off the gas it returns to 1.5 step on the gas again it goes back to 2.5 or 3 i would like to know whats wrong and how to fix it i have kids and i can’t have this


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