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surging/'breathing' - performance lag

Fuel System

Vehicle Information: Year: 1986; Engine (Size, Modifications): 3.3; Total Mileage: 117000;

recently after car has sat idle for a week or so, noticed two issues - really rough/poor idle, never seems to clear up when finally warmed up, and poor acceleration - seems to labor or 'breathe' until boost gets to near full level - and during partial boost medium acceleration, seems to 'surge' or not accelerate smoothly. also noted that idle vacuum lower than usual - previously about 290 to near 300 millibars, now 265 to 270. No changes, no parts added/changed out, nothing other than a little idle time. Recently had CO% checked, and distributor advance system checked as well as vacuum lines - all checked OK. Any ideas?

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