Low idle issues

[Restrain_this]

Hey guys,

New to the forums here. I've gotten many tips for various issues I've encountered so I'd like to thank you guys for that!
But now I've run into a new issue and haven't found a solution yet.
I recently got the PCM on my MSP reflashed which fixed a major hesitation issue I was having. But immediately following, the rpms dropped to 400-500 while idling. Before the reflash it idled at about 1k. It occasionally fluctuates but as long as I'm idling it stays in the 400-500 rpm range. Also, after accelerating then dropping into neutral the rpms will dip extremely low almost to the point of stalling.
I'm certain these issues have been encountered before by others and if there are any suggestions as to what I should do I'd really appreciate it.

 

[hornsfan10609]

No check engine light? It could be caused by a dirty MAF, dirty EGR, dirty IAC, vacuum leak, even a dirty or failing primary O2 sensor or the timing being off.

 

[Restrain_this]

Thanks for the response.
Initially there was no check engine light. It's been almost a week since the reflash and the CEL just came on yesterday. Gonna have to take it to the auto parts store and see what code it's throwing.
Thanks for all the suggestions. I've cleaned the MAF and EGR. I guess the IAC is next on the list.