Check the EGR valve behind the valve cover on the left and the PCV valve off the valve cover. Pinch the PCV hose closed; it should click. If there is no click, check for leaks or replace the PCV valve.
A 1999 Honda Accord with 102,000 miles sometimes starts, then nearly dies right after the key is released: it cranks at a high idle, drops very low, then returns to normal. Plug wires and the fuel pump were already replaced. The expert recommends checking the EGR and PCV valves and testing the PCV by pinching its hose for a click, then checking for leaks or replacing it if there is no sound.
