Understood. But there is a screw at the end of the throttle cable where you can adjust the spring tension. If you take up some slack off the cable, it will rev the engine at a higher speed at idle.

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2001 Ford Ranger with the flare sides. 4x4 with a 4.0 engine. The only thing I did so far is: F/R Brakes, rotors, drums, F/R shocks, tires, bed cap, cone filter, hanger/shackles, F/P wheel bearing, upper control arm, lower ball joint, filler neck, fuel filter and DPFE sensor, muffler, sway bar links and spark plugs!