Sounds like either you have a faulty o2 sensor

OR

you have your a/f ratio WAY to lean or rich to the point where your just gonna start throwing your o2 sensor code because it cant adjust itself anymore. Your probably pulling timing because your getting counts of knock maybe? Due to the fact that your running to rich or lean.

I occasionally see some knock but its like .4
This is the sensor the second sensor Ive tried since the cel

No im not running 20psi on the 440s I wouldnt do that. My 16g spikes to 20psi at 4-5k when at wot.
I have a walbro 255 i forgot to mention also.

Alight, the way you had that worded it sounded like you said stock fuel system. I'm almost positive I had that backwards I belieive O2 sensors produce voltage upon lack of O2. Therefore your running rich and that would also explain the stumbling.

.4 knock retard is just over 1 count of knock. I believe 1 count is like 3.33, so thats not too bad but should be tuned out.

Would it be safe to go get my car tuned for e85 like this? Ill have bigger injectors and everything dont worry

Do you have a wideband installed? Is that cycling correctly?

No wideband yet but the shop im getting tuned at has a wideband to use. I dont drive this car often so its cool if I dont have a wideband in it right away

I dont know, maybe ask the tunner. I know that at wide open throttle(WOT) The ecu goes back into open loop meaning it ignore the O2 sensor so if they are doing WOT pulls for tunning it isnt going to make a difference but your going to need to it to cycle properly to obtain good fuel trims. Your going to have less power during anything less that WOT due to it being in open loop since it will be just dumping fuel also causing poor fuel economy.

I would highly recoment getting a wideband! Since they have one to use thats good, but its nice to keep an eye on your AFR's to make sure your not damaging anything.

Yeah ill be getting a wideband but probably not for another week

Sounds good, I love my Inovate MTX-L. Great gauge, works with ECM Link well since it allows me to log my AFR's.

yeah Ill probably get a innovate wb, Ive heard they work with Ecmlink better than Aem uego does.