idles up and down!

[ROACHE2010]

so when i pull up to a light and put it in gear the car idles from about 1500 to 700 rpm...but if i put it in netural it just seems to idle higher than normal but doesnt idle up and down.its really annoying having to keep putting in netural please help!!!

[Ryan]

Details man! ATX? MTX? Year?

INTAKE LEAK! http://www.mx-3.com/phpBB3/search.php" onclick="window.open(this.href);return false;

[ROACHE2010]

92 with the klze swap.

[Bolverk]

Mine did the same thing until I replaced the accordian part of the intake tube.

[mikeinaus]

mine did that on my old motor. if i lowered the idle a bit it went back to normal. check for vacuum leaks thow... there the most common cause of jumping idle.

[Mooneggs]

ensure the TPS is adjusted correctly and you may need to adjust the IAC... if nothing else you can turn your rear defrost on and it should even it out...

[TMP39]

try cleaning your iac and check for vacuum leaks. and clean your tb while your at it. those are usually the main three things i find that find cause that problem when a car comes in at work wit hthe same idle up n down problem. kinda gets repetative after a while