My current digifant 87 Westy just experienced these FI missing, surging, and bucking problems for the first time at 222,000 (original engine) miles. I'm very frustrated. I purchased and installed the "Vanagon Syndrome" harness and it made a major difference. However today I replaced the O2 sensor which has been disconnected with no obvious ramifications for the past 20K miles, and vehicle is again running poorly. Question: Do I need to reset my O2 sensor to have it work properly? I removed the LED hundreds and thousands of miles ago simply thinking it as a dumby light? Thanks!