93 vit ,.with what engine? there are 5 or 6 used world wide
and what country, some of these are JDM cars, with no smog parts.
tell that it does good and wrong,
no transmission stated or engine 3 tranny sold and more engines.
my wild guess. is your tranny slips?
is is this a bad idle post. idle controls are out of control?
my guess 2 is its a Manual 5speed stick transmission?
guess 3 its not a USA or Canada Vitara. but where>?
ok its IDLE surge. ( the ecu will do that if fuel mix is lean)
with lean fuel mix engine power is very weak and idle is impossible to
control , by you or the ECU.
Guess 4 , the Engine is G16 engine.
but what type class is it. 8v, 16v, EFI, or carb.
here is the chassis tag , see codes here, these tell me what car you
really have.
http://www.fixkick.com/specs/Body-TAGS/html/image_10.html
VIN and FAE number tell ALL.
here is smog free JDM car tag. note lack of data
http://www.fixkick.com/specs/Body-TAGS/images/96-JDM3dr16v.jpg
the VIT has huge variances world wide,
which one is yours, identify it and all gets 100x more easy.