chuggle at idle on northstar engine

It was time for the plugs and wires, the fuel pump was replaced to correct an extended crank time after sitting for awhile, and the mass airflow was replaced to correct a CEL, but the chuggle still remains only at idle and in gear, drives great on the road, sprayed carb cleaner aroud intake with no changes in idle so am assuming there is no vac. leaks.

there is one problem area for vacuum leaks. the bigger rubber hose from the throttle body to the intake splits on the bottom where you cannot see it. have a shop do a smoke test on the intake to confirm. Roy