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Not really sure what's wrong with it. I just changed the air filter, spark plugs, and the wires. It still surges. When I turn it on and sometimes at a stop, it will go to REALLY low RPMs then go right back up, then sometimes cut off. Only other things I can think of is this hose I found in the front. Does anybody know what this hose is?
http://www.yourcobalt.com/forums/members/portvegas-albums-engine-picture3826-hose.jpg
 

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vent hose
 

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pcv hose. it connects to the intake after the mass airflow sensor. idle is fluctuating because there is more air going into the engine than the maf is detecting. simple. just patch it up. replace it, whatever. just make sure no air gets in or out after the maf sensor.
 

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Damn that hose looks old and oil soaked! Do you have a CEL? If you get a chance take it to autozone (or auto parts house) where they can read the codes to tell you if something has been picked up by the ECM.
 
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