I replaced the o-rings on the injectors and injector #6, and i also replaced many of the vacuum lines/fittings for good measure. I don't think any of them were leaking, but they were old... It runs awesome now when cold I'm now throwing an intermittent P0131 "O2 low volt B1S1" and P0133 "O2 slow response B1S1" and it is still surging at idle in P and N at operating temp, though. I didn't have a lot of time tonight, but i did unplug the MAF when it was surging and the idle smoothed out on the default. I didn't think to unplug the O2 sensor to see if it does the same thing, but I'm pretty sure O2 sensor #1 is bad. Do you guys think maybe the MAF is bad too? I have the BlueDriver Scanner so I can log data. What should I look for?

Thanks!