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2006 Cobalt LS 2.2
38xxx miles, AT

Car runs normal when cold, but about 5 minutes after startup, the idle will drop from around 900 to 650. When coming to a stop, the idle usually drops even lower before leveling back out to 650. It has never stalled out, but has came close a couple of times. No codes are being thrown. After looking through other threads with similar problems, I cleaned the throttle body thoroughly, but it made no difference at all. I hooked a OBD cable up to it and pulled this graph of what is going on. RPM is on bottom, MAF on top. There seems to be a distinct moment when the idle begins to drop and then levels off.

Any thoughts?

 

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mine runs the same (around 600) when at idle...nuttin to worry about, don't think anyways...mine hasn't stalled yet...only time it came close to stalling was when I had my B&M in Stage 2 and my tranny in I and I floored it and then had to come to a complete stop (red traffic light), my RPMs shot right up, then very quickly fell, almost stalled but never
 

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mine does the same thing,
pisses me right off
mine has stalled,
and through a code once, but fixed it self after being shut down over night,
let me know f you find out what it is
 
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