huh, well, it is what it is.

Ok, I wd-40'd the purge valve and it is now ticking away. graphited the cable where I could and lubed the linkages, although nothing was really obviously sticking, there is slack on the cable. also replaced the stop light switch.

after wd-40'ing the purge, but prior to the graphite and switch, the car went into the surging thing again on the way home from work. the additional code from pin 8 was 13, the same I always get when this surging thing happens. I cleared all the codes after the work above was done, we'll see what happens over the next few days. I'm not optimistic though.

What does the code 13 mean exactly? I have changed the O2 sensor and the fuel pressure reg., as well as the coolant temp sensor, cleaned the MAF, replaced the EGR (had a code for that previously). The throttle body is gummed up a little on the edges of the butterfly plate, but not bad. surging is an intermittant thing, once every few days, sometimes corrects itself. thoughts?