idles too high

[lineman]

I'm still searching for a solution to lower my idle. The truck idles around 600-700 rpm but when it is put into gear( drive/reverse/first/second) the truck idles up to around 900rpm,and if put into neutral or park it goes back down. Air temp and engine temp hav no effect to the problem. sometimes if im at a light in gear and i press on the brake very hard to put a load on the engine it will go down to 600-700 until i press the accelarator again. And ideas?

Thats normal. It idles up to compensate for the load being put on the motor by being in gear.

[lineman]

Thanks for the reply! Your probably right, but my friends '02 7.3 and his '00 7.3 don't idle this high. If i let off the brake in gear it will take right off , his '02 will just creap ahead. This truck has always done this since i bought it 50.000 miles ago, when it was all stock.