2004 whipple mach 1 stumble at high throttle?

[Svt_devin]

The car is a 2004 mach one with forged internals, cobra pully swap, 2.3l whipple, 60lbs injectors, stock fuel pump, tuned to around 600hp on 93 pump gas. Owned the car for 2 days. The night of the purchase it ran great, pulled super hard, Ran just like my 03 cobra... Next day fire it up and it runs fine just driving it but anything past 1/2 throttle it wants to spit and sputter. Throwing a code for lean bank 2 sometimes. We changed all the plugs and no difference. Anyone have any ideas what else it could be? I am thinking fuel pump and or needs a new tune...picture of plugs is from bank 2

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[Nightmare90gt]

Coil packs?

 

[Svt_devin]

Coil packs?

Havnt messed with them, idk if they are good or not

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[me32]

Stock fuel pump? 600hp? Doesnt sound right. You need and upgraded fuel pump and if its still returnless you should add a BAP. Those plugs look really really bad. Like water got in. I would also do a compression check.