I wanted to point out that $20 EGR valves are hit and miss. I researched this question and also built an EGR valve tester to understand how they work. I purchased an inexpensive valve brand new to see how it would perform. The new valve caused "herky-jerky" which I did not experience with my old EGR valve. The old EGR valve, while on the way out, was not so bad as to cause this. We tore the new valve apart at the dinner table during the recent Insight fest in Ohio. The new valve had a different sensing mechanism than the old which held promise for longevity compared to the potentiometer-based sensor in the OEM valve, but the jerkiness it caused put it to rest. It may be a control loop issue (well, obviously, it is a control loop issue of some kind.)Check the search box for alternate EGR valves there are some from other models (accord 4) that will work and cost about $20.