Studdering at start

I have a '97 Cavvalier manual trans. The problem is when I start my car after about 30 seconds it wants to studder, sometimes die. If i rev the engine when it settles back down it studders. This only goes on for about a min then it's fine and it's only on start up after it has sit for a while. Also if i pull out and go I have to take off pretty quick cause if i go slow it studders. But once i get into 3rd gear it's fine.

I've changed the air filter, spark plugs, fuel filter and the 02 sensor on the exhaust manifold. I'm currently working on changing the one after the cat (corroded). Any idea's? Also my temp gauge used to sit at 195 and now it sits almost in between half (195) and 3/4. I don't know if that has anythig to do with it. I'm not exactly an idiot when it comes to cars but this one has me stumped.....help

I dont know if the 97's have the IAT sensor but thats what it sounds like to me.

I changed the IAT sensor and nothing happened. So I went and bought an Idle Air Control valve and changed it and now it works like a charm. I guess my old IAC was burnt up. Thanks for the help tho!

i have a 98 z24 and mine does that same exact thing where is the IAC valve i looked in my crappy haynes manual and it doesn't mention it

it's on the front of the engine on the throttle body. at least that's where mine is. it's really accessible and it's held on by 2 screws. you'll need a 20 star bit screw driver for em.

did you have to do any type of reprogramming cuz i just bought the new IAC and the damn thing is still doing it

i own a 976 chevy cavalier z24 maual as well an it starts up fine an all but after its warmed up when i come to a stop in first as soon as i push on the gas it

drops really low in rpms an sputters rapidly so i have to slam down the accelerator to keep from stallling an i usually peel out , im a fairly new driver an i

love my car so sorry if i seem like a noob to this stuff i hope u guys can help, also my temp needlee is stuck as well like the first guy who started this post

but the car is still driveable but is it ok to drive it the way it is untill i can pay to have it fixed or what should i do plz help thnx

I recently had the same problem... I too took off the IAC and gave it a good spray with carb cleaner; along with the PCV, and replaced my plugs; not enough. So I look around some more, since it is obviously some sort of emissions problem-and I see this small black hose under the throttle body connecting directly to the intake manifold and to some sort of sensor with 3 wires (MAP)... anyway the hose was dry rotted on both connecting ends and split wide open; therefore faulting the MAP sensor-which can cause symptoms of the IAC, PCV, incorrectly or worn spark plugs, ext.

I'd say check it out-worth a shot; cost me less then $1 to replace and I have no trouble now! My car is a z24 the throttle body is right in the front facing up when you are looking under the hood from the front and the MAP is a small square almost flat black chip looking device with 3 wires coming from it, directly to the right of the throttle body. Underneath the MAP the hose connects and is about 5" or so long, connects to the intake on the other end (which is directly below and a little to the right of the IAC.

ya thnx a ton for the advice its late here so ill give it a look tommarow before the tech game ill keep ya posted if it works or not oh an is it safe to take off hose nothing liquid or anything will leak will it? thnx again for the help hope thats whats wrong lol keep ya posted take care


kent

It's funny you mention that hose thing now...i talked to my neighbor and he said it was the MAP sensor so i went and bought it trusting him and when i went to replace it i saw that the hose was all cracked and dry rotted like you said...I replaced the hose and the MAP sensor anyways and it still does it...so now im told that i have to go in and reset the computer because it is showing that it is running to lean(meaning too much air it getting in)

i dont know man u might have something else wronged my tuibe it was rotted as well an its runnin like a dream now so ya im not sure it may be a feul injection problem but im just goin off a hunch