Rough Idle. 1/8" gap between the throttle body and the upper intake manifold. on 2000 Buick LeSabre

Every time there is a stop light, the car vibrates and shakes unless I step on the gas a little bit. I'd love to fix this.

Asked by for the 2000 Buick LeSabre
seek a diag and est sounds like poss vac leak
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You state 1/8" gap between throttle body and intake. Maybe I'm reading it wrong , but is the throttle body loose? Is the gasket gone? That would definitely cause problems.