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Something with your Vacuum booster is bad. Probably the diaphram. You may be able to get a replacment at the local parts store, but from what I remember, they cost a little (150.00?).
You can verify your vacuum booster is bad, by plugging the vacuum hose (about 1/2 inch in diameter) that runs from the rear of the intake manifold to the brake booster (large circular device behind the master cylinder). Plug the end that attaches to the booster and your car's idle should return to normal. If that is not the case, check the hose.

Good luck.

Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat
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