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Is the fuel pump stock? If yes, you'll want to upgrade that. How about the regulator, also stock? If yes, definately get a new one, they don't last forever and can cause a lean condition, or even a rich condition, depending on how it fails. I doubt you're past the limit of the 19's but you could go up to 24's, you're close enough to be able to.
Those O2's probably made a difference, especially if they weren't hooked up before, they're necessary for the computer to be able to operate properly.
 
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