02Z28LS1

iTrader: (2)

well, i go to get in my car to go on my lunch break at work just now, and as i back up out of my parking spot, the idle drops from the usual 850 - 900 to around 400 - 500. i rev it a few times to about 1500 - 2000, then let off, and it does the same thing.

so i start off down the road, and it drives fine, no surging/sputtering, nothing.....until i get to the stop light and let off the gas and go into neutral, then it drops to 400 - 500 again, and is idling kinda rough.

I get to the drive-thru and now it drops to ~500, then after a few seconds, starts to climb back up, around 700 - 750, and keeps doing the same thing the rest of the way back to my job every time i come to a stop and go into neutral.

the car/engine have less than 33k miles on them. it has done this once before, but that time i turned the car off & back on, and it ran fine again.

what would cause something like that? bad gas or a dirty air filter? anything else come to mind?

Gearhead1

Mine started surging and acting goofy when the O2's started going bad. But with that low of mileage, they should have a lot of life left in them. Has your check engine or SES light come on at all??

Z28LS1camaroguy

iTrader: (3)

Possible vaccum leak, when my PCV system lines broke my idle was surging and would dip down really low to like 400-500 range when coming to a stop. deleted the PCV and no more surging or any problems like it again, but if you have the SES light i would check 02s those can mess your idle up or possibly see about the idle adjustment screw on the throttle body.

1LoudTA

iTrader: (11)

plugs/wires? maybe ur car is due for a tune up.. and go to an auto parts store and buy techron.. no other crap fuel injector cleaner or anything make sure its techron, wait until ur about 1/4 tank then puta bottle in.. if your not throwing any codes i bet it will work

02Z28LS1

iTrader: (2)

nope, no codes

i doubt it's the adjustment screw on the TB, if the idle comes back up after the car has been running for a while.


but yeah, i'll try some of that techron next time i fill up...i kinda think it might be some bad gas tho, because i just filled up on the way into work tonight, and i stopped at one of the run-down 'hood gas stations, just because i wasn't paying attention to my gas gauge until the "check gauges" light came on, and didn't really have time to double back to one of the places i usually get gas.

b005td

iTrader: (9)

bump coz i m having a same problem

Y2KblueZ-28

Clean the MAF sensor and the Idle Air Control sensor sometimes they might be a little dirty and that caused mine to do what your did. I just pulled off both and cleaned them with B12 chemtool. Make sure not to touch the wires in the MAF youll **** it up and that if you didnt know is expensive to replace. Make sure all the carbon buildup is off the IAC sensor . After cleaning it once all hooked back up leave the iac sensor un hooked and turn key on then hook it back up , turn key off and on a few times then crank and see if that works it did for mine.

nemss1

heard a bad alt can cause this also