not easy.
idle is the last thing that works correctly on any EFI motor.
i recommend joining our experts on our forum and ask there.
interactive , is the only way to discuss this complex subject.
first , you must tell us the motor type.
8v
or 16 valves.
they are night and day in the idle department.
http://www.suzuki-forums.com/suzuki-sidekick-escudo-vitara-geo-tracker/
hawk suzuki has what you need 18887268724
On my 93 suzuki sidekick the check engine light came on at exactly 120000 miles.It can be reset if you take your drivers side speaker out you'll find a switch in there to reset it.If the problem occurs again then you probably have a real problem.If you vehicle is not running any different then I wouldn't be that concerned.
The Haynes auto repair manual for Suzuki Sidekick / Geo Tracker 1986-1995 has many pages in chapter 12 with common wiring diagrams.
Check this link http://carfix.stufftoread.com/find-parts.html
the neutral safety switch located on the rightside of the automatic gearbox.
pull glove box door. pull resistor block. see hard to find parts here. world wide web dot kick-fix dot com (<dig?)
name it, there are 1500 parts on this car, 3000 on new cars. name one part.
Have you looked under the hood on the driver side? I believe it has a black plastic cover over it.
http://www.kick-fix.com/fusepanel-left-knee1w.jpg 3rd posting in 24 hrs/.
My first guess would be that you have a sizable vacuum leak some where... Check to see if you can find any vacuum hoses that have disconnected or that may be cracked or split.
i have the same problem did you find why is was doing that?
at the auto store. buy the best Dot3/4 and use that. nothing else. never use dot5 mineral fluid.