dannym,

Similar thing happened to me. The vacuum main line came loose from the vacuum pump (VP). This is no big deal, you just reattach the vacuum line.

So its either the vacuum line, the one from the VP to the brake booster or the VP has stopped working.

If the VP has stopped worling, you should check the VP right away because if it has come apart inside, the parts may get into the timing chain and cause engine damage.

P E H