1993 accord LX- Thought I had the problem solved by taking the 6 small port plugs out of the emissions system and cleaning up all the buildup plus opening the ports back up that were plugged. When I put a vacuum gauge on the black rubber hose going from the control box to the EGR valve there is an initial buildup of vacuum upon acceleration but within seconds it drops off to zero. I switched control boxes and used one my brother had from his 91 accord he parted out and still had the same result. Mpumas has been giving me a lot of help but no luck. My daughter is going to apply for assistance with the state and see what happens.Any other suggestions would be appreciated.

As explained earlier, the EGR valve only opens under certain conditions. It is not open at idle but starts to open about 1500 RPM, I think, and only when the car is in motion as determined by the VSS sensor and then closes at a certain higher RPM. The opening is controlled by the ECU. So unless you have the front wheels on a treadmill, you are not going to be able to simulate the open and closing of the EGR. What you experienced is probably normal under your conditions and indicates that the ECU is commanding the solenoid to open as evidenced by vacuum at the EGR. I think you need to pull a vacuum on the EGR with the engine at idle and see if the engine stalls. It should if the ports are clear.