What all have you done to the car?
Is it a factory Mass Air Meter? If not that might be an issue at idle. Injector upgrade? Fuel pump upgrade? Vacuum Leak? Have you swapped out the intake and maybe there is a vacuum leak now? Adjustable regulator? You could have issues with any of these for a lopey idle.
What is your timing set at? Maybe too high?
Just a few things to consider.
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