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when at idle it is revving at 4000 rpms i clean my throttle body and its now idling at 2000 rpms, i checked all my vacuum lines and there is no leaks, i tryed to clean my idle air control valve but its still dirty. does anyone have a clue why it is still revving high?

i have a 91 ford explorer 4.0 4x4 xlt and i put a new used engine in it and it was revving at 4000 rpms. i found a vacuum leak on my brake booster. it is now revving a 1500 rmps put im only getting 10 mpg but before i put the new motor i was getting almost 20 mpg?

im new to off roading hello everyone, Im new to off roading i just bought a 91 ford explorer its a rwd 4x4 the owner who i bought it from changed the 4x4 from automatic to locking hub. how do i put the suv in to 4x4? Its has 4 kc lights on it with a custom bumper and i put 4 new 31 x 10.50...