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A final idea. Did all of the DTC's that you got start at once? If so, it's possible that you may have a bad ground. Easy thing to rule out, take a battery cable, connect one end to an unpainted part of the motor and connect the other end to the negative battery terminal. If things...

Well, that doesn't sound like a vacuum leak, so I may have been barking up the wrong tree. Might be time to have someone take a look at it. Could be almost anything, ignition and fuel being the most likely suspects. Sorry I wasn't much help.

If you don't have a backup, then I wouldn't suggest tackling it yourself. I could be wrong, I'm just taking an educated guess. ;) Does it seem to run ok at highway speeds? Usually, with a vacuum leak, once you get the RPM's up a bit, it'll run normally.

Running lean and a vacillating idle, both point to a vacuum leak. I looked for one on my Cobra for quite a while, before finally breaking down and starting take everything apart until I finally found a split hose under the intake manifold. Different car, of course, but what I'm suggesting...

Vacuum leak....