Vac leak?

[Sandman]

I've got the symptoms of a vac leak, idle is up and down but the car doesn't stall, no codes. The TB/blower gaskets and injector o-rings are like only 3 weeks old, didn't start getting this problem till yesterday. The whole vacuum system is new and everything is hooked up. I haven't gone in deep with it but is there anything else that could be the culprit other than a vac line or gasket?

[blueguy]

dry rot?

[Sandman]

All the hoses have been replaced not to long ago. I'll dig into it once I get some spare time.

Could not having a maf screen cause this? I took mine out since it was just about cracked in a few pieces from something smashing it. Been meaning to get a new one.