My first thoughts are that the brakes are not your biggest problem. Something tells me you get the car running well the brakes will follow (how surprised does that make you?) ...

First off, when you start and it goes a few times then dies have you pulled a plug or two to see whats up? I'm wondering if you have oil or fuel coating the plugs. Running faster (and therefore hotter) will clean your plugs enough to keep the engine from stalling. If the plugs are coated in gas when it stalls out you probably have a big air leak. Your brakes rely on vacuum and a huge air leak can kill that pretty quick. I don't think an unattached line would create this much problem (well, maybe the big one that goes to the oil separator) but most likely your intake manifold's loose, your air hoses between the MAF and the throttle body is either loose or cut, your vacuum tree isn't mounted properly (maybe the o-ring fell off), or the throttle body isn't attached well..

You pulled out and replaced the ABS module, or is it still out? (though if its still off how are there no codes?)

As to your oil leak, have you looked to find its origin yet? If your cams were worn you might have had to push the seal in a couple mm more and if you just made it flush you might have the leak there. However, if its the RMS I'd try running an AutoRX through the system with hopes that it will clear the sludge, lube the seal, and re-seat it.