Not to overhead mmhoward1 but with a vac leak the idle would have increased drasticly and not necessarily drop erracticly, and LTFT would have taken effect. It could possibly be that the EGR being stuck open. When the car was running did ur check engine light come on and off? Did you do any type of emissions test? Also check your MAP sensor, sometimes that goes bad as well, but I think most likely the EGR. You may have to do component testing since the engine is not starting. Grab yourself a Do-It Yourself book for specs and a DMM meter!