bad idle, need help
this problem its driving me crazy, 
the rpms at idle are too bad from 900 to 500 the vacum gauge goes to 15, i change the plenum gasket, the pcv valve and cleaned the maf, the the idle return stable at 900 but only for 3 days
and now its worst, yesterday i tried to adjust the idle with the iacv valve screw and i hear a shhhhhhhhhhhhhhh like a vacum leak on the screw, its that posible??? those are vacum leak symptom´s but i´m not shure if it could be for the screw.
my other theory its the crappy gas that we have here in mexico, some gas stations use magna on the premium pump
the rpms at idle are too bad from 900 to 500 the vacum gauge goes to 15, i change the plenum gasket, the pcv valve and cleaned the maf, the the idle return stable at 900 but only for 3 days and now its worst, yesterday i tried to adjust the idle with the iacv valve screw and i hear a shhhhhhhhhhhhhhh like a vacum leak on the screw, its that posible??? those are vacum leak symptom´s but i´m not shure if it could be for the screw.my other theory its the crappy gas that we have here in mexico, some gas stations use magna on the premium pump
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Originally Posted by paulino_kamote 
good point, i dont hear any knock even with de a/ac on.
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