The computer does - there is no way to adjust it. If it is improper something is wrong with one of the sensors - that is the most likely problem.
rough idle smell gas
no.fully unajusteble
You need to replace or clean the ERG valve. This will help with your milage too.
You might want to check your main vacuum line
There is no idle screw. The idle air control valve controls the idle and can be set on different settings. You should consult a Ford dealer or mechanic for proper settings.
you cant there is an electronic throttle position sensor that controls idle may be bad
A faulty fuel injector can cause your Ford Windstar to run rough and feel like it's going to stall. A dirty or plugged air filter can also cause the vehicle to stall.
go to autozone.com
Trouble code P1507 means: Idle air control (IAC) underspeed error
Either the throtle cable is hanging or the idle control solonoid is not working
A serious vacuum leak could cause that.
Might this supposed to be IAC (Idle Air Control)??If so, see "Related Questions" below for more