I just replaced the o-rings on my injectors (88 Trooper, 2.6), and now I have that lovely Isuzu surging idle. Once the truck is warm, the surging starts, every time I stop. It will sit there and bounce between 1000 and 2000 rpm, run up to about 2500 and then drop to 1100. If I blip the thottle, it will drop to the usual 900. I have had this problem in the past but it has been intermittent at best, and it seemed to be cured when I replaced the vacuum lines. I am pretty sure that I have the vacuum lines routed correctly, but I just can't be sure. My vacuum diagram is gone from the hood, and I can't be sure I have the hoses routed proplerly. The surging was not an issue prior to the o-ring replacment. I have recently replaced the vacuum lines, so I know there are no vacuum leaks. If anyone has a picture of that vacuum diagram, I would greatly appreciate it.