Rough running

[grad70]

So I have been able to get my 6L 70 C10 to start, however it seems to idle about right but when I give it throttle it doesn't like it at all. It really sputters and runs awfully rich. Currently only have open Doug thorely headers with the 02 bungs. Does running open headers throw off the oxygen reading that much?

I have a feeling my MAF sensor is junk but haven't had time to dig into this much as I have been traveling a lot lately. I plan to pull ltft to see if there are any other issues I can troubleshoot.

New rear mounted gas tank, fuel filter, spark plugs, and I have recently had all the injectors out. I cleaned them with a syringe and a 9 volt battery.

Any opinions are appreciated. Thanks!