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Re: 1995 f-150 a/c
My 95 F-150 5.8L was doing the same thing minus the idling problem. Mine was the little vac check vlave. Yours definately sounds like a good size vac leak. Do what RH said and make sure to double check those plastic vac lines. I found one of mine up at the recirc valve (the white one) was dry rotted and rubbed through from the hood.
Yeah, a brake booster can lose a lot of vacuum though. That's a large vac line. Inspect that check valve there at the booster while you're there.
Good Luck
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