Need help with lean stumble on Holley DP

I also think it is debris in the idle circuit somewhere. Haven't had this stumble until Friday when I drilled my PVCRs. I'm guessing it's a coincidence, or possibly some of the tiny metal shavings? I used air to blow out the entire metering block after I drilled. Could a dirty needle and seat cause this? Seems like that is usually more of a flooding issue.